How to Know When to Buy or Sell in Forex: A Nigerian Trader's Guide to Not Blowing Up

Your first lesson is this: there is no perfect signal. No RSI reading, no MACD crossover, no candlestick pattern will ever guarantee a win. I learned this the hard way in 2018. I had a beautiful setup on GBP/USD. The RSI was oversold, price was at a major support level I'd drawn, and a bullish pin bar formed. I went all in, convinced it was a sure thing. A few hours later, some Brexit headline hit the wires and the pair tanked another 150 pips. My stop-loss was vaporized. I lost over $2,000 in a trade that 'technically' should have worked.

The market doesn't care about your indicators. It cares about liquidity and news. In Nigeria, where we're often trading on international brokers like Exness or IC Markets with high use, this mistake is fatal. You're not looking for a green light to trade. You're looking for a confluence of reasons where the odds are slightly in your favor. That's it. Thinking otherwise is a fast track to giving your money back to the market.

Forget complex systems. Your decision to buy or sell should rest on three simple pillars. If two or more agree, you might have a trade. If only one does, you're gambling.

1. Price Action & Structure

This is what the price is actually doing, stripped of all indicators. You need to answer: What is the trend? Where are the key highs and lows (support and resistance)? Is the market making higher highs and higher lows (uptrend), or the opposite? A buy signal in a strong downtrend is a low-probability gamble, no matter what your oscillator says. I only consider buying when price is reacting bullishly at a clear support level in an uptrend, or selling when it reacts bearishly at resistance in a downtrend.

2. Confluent Technical Indicators

Indicators are tools for context, not crystal balls. Pick two or three you understand deeply. I use the RSI indicator for momentum and overbought/oversold zones (not for direct signals), and moving averages to define the trend's direction. The key is confluence. Maybe price is at support (Pillar 1), and the RSI is showing a bullish divergence after being oversold (Pillar 2). That's stronger than just one alone.

3. Fundamental & Sentiment Context

This is where most retail traders in Nigeria sleep. Is there a Central Bank of Nigeria (CBN) monetary policy announcement coming up? What's the price of oil doing (huge for Naira pairs)? Is there major US economic data like NFP? You don't need to be an economist. You just need to know when not to trade. I never open a new position right before a major data release. The spread can widen massively, and price can spike through your stop-loss in milliseconds. Check an economic calendar. If it's red-hot, step aside.

Let me walk you through a recent trade I took on USD/NGN (though I trade the Naira via USD/NGN proxies or just focus on majors like EUR/USD due to liquidity). This is how the three pillars came together.

In early March, USD/NGN was in a clear uptrend on the daily chart (Pillar 1: Trend). Price had pulled back to a previous resistance level, which had now become support. This is a classic 'retest' area.

On the 4-hour chart, the MACD indicator was hovering around the zero line but started to curl upward (Pillar 2: Momentum not contradicting the trend). More importantly, the CBN was scheduled to make a interest rate decision. The consensus was for a hold or a hike to combat inflation, which would be supportive for the Naira (Pillar 3: Fundamental context not bearish for Naira).

Knowing when to buy or sell is useless if your broker's costs eat your profits or your use kills you. Let's talk Naira and Kobo.

First, the spread. On exotic pairs or during volatile sessions (like when CBN news hits), spreads can blow out. A 15-pip spread means your trade is already 15 pips in the hole when you enter. Your 'perfect' buy signal needs to overcome that just to break even. This is why I stick to major pairs like EUR/USD where spreads are tight, often under 1 pip on brokers like Pepperstone.

Second, use. Brokers here offer insane use like 1:1000 or even 'unlimited.' This is a debt trap, not a tool. With 1:1000 use, a 0.1% move against you wipes out your entire margin. I don't care how good your signal is. Using max use is how you get a margin call from a tiny, normal market wiggle. I never use more than 1:10 use on my trades. It forces me to be more selective with my entries and protects me from myself.

Finally, remember the 10% Capital Gains Tax. Factor your net profit after costs and taxes. A 5% gain might only be 3.5% in your pocket.

This is the most important skill: knowing when to do nothing. The market will be there tomorrow. If your three pillars aren't aligned, if the news is chaotic, or if you're just tired from unstable light, the best trade is no trade.

I have a rule: after two losing trades in a day, I shut down the platform. Emotion is creeping in, and your judgment for the next 'when to buy' signal is compromised. Similarly, if I can't clearly define my risk (where my stop-loss goes) before entering, I don't enter. Period.

Sometimes, the highest-probability action is to stand aside and preserve your capital. This isn't a missed opportunity, it's a successful execution of risk management.

Before you click buy or sell, run down this list. If you can't answer 'yes' to most of these, abort the mission.

1. Trend & Structure: Am I trading in the direction of the higher time frame trend? Is price at a logical level (support/resistance)?
2. Indicator Confluence: Do my 1-2 key indicators support the trade idea, or at least not contradict it?
3. Fundamental Filter: Is there a major economic news event in the next hour that could cause chaos? (If yes, wait).
4. Risk Defined: Have I calculated my position size using a position size calculator? Is my stop-loss at a logical level where the trade idea is invalidated? Is my risk 1% or less of my account?
5. Reward vs. Risk: Is my target (take-profit) at a minimum 1.5 times further away than my stop-loss? (A 1:1.5 R:R means you can be wrong more than you're right and still profit).
6. Mental State: Am I calm, focused, and not trying to 'get back' at the market for a previous loss?

This checklist forces discipline. It moves you from an emotional gambler to a systematic trader. The 'when' becomes a process, not a guess.

Once you've mastered the basics, you can refine your 'when' with pure price action. This means reading the candlesticks and order flow. For a scalping strategy, this is critical.

Look for patterns of momentum failure. A strong bullish move that starts forming smaller and smaller bullish candles is losing steam - maybe not a time to buy more. A pin bar (a candle with a long wick) at resistance can be a powerful sell signal, especially if the next candle closes below its low.

For swing trading, look for consolidation patterns like flags or triangles breaking in the direction of the main trend. The 'when' to buy is on a confirmed breakout candle closing beyond the pattern's boundary, not when you first see the pattern forming.

Remember, these patterns just add weight to Pillar 1 (Price Action). They are not standalone signals. A 'head and shoulders' pattern in the middle of a ranging market is far less reliable than one that forms after a long uptrend.