Evaluate your costs
The costs of trading the forex, commodity, index, and share markets come in a few forms. The first is the bid-offer spread. This is a spread that describes where your broker is willing to purchase the asset you are looking to trade, compared to the offer which is where your broker is willing to sell the asset you are looking to trade. Your broker is trying to buy on the bid and sell on the offer to make money. The spread is the cost of trading. This spread needs to be incorporated into your trading strategy.
Some brokers also charge commissions. This is a fee on top of the bid-offer spread. The commission fee also needs to be incorporated into your strategy. Lastly, there is slippage. This is the amount the market generally moves on average when you try to trade. With liquid currencies such as the EUR/USD, the market has very little slippage. Emerging currencies pairs such as the IDR/USD will have greater slippage.
If you take your costs into account, you will need to potentially alter your risk management to generate the gains you are looking to achieve. For example, if the bid-offer spread on the EUR/USD is 1 pip, and you trade an average of 100,000 using leverage, the average bid/offer spread is $9 per trade. If the slippage is another pip, that is another $9 per trade. If you are trying to make 20 pips per trade, and risk 20 pips, you really need to make 20 pips for every 18 pips you risk to incorporate the costs of trading.