There is only one piece of advice to solve the problems of traders that can be drawn from studying Forex trading psychology - and that is to develop a trading plan and stick to it. As a trader in doubt, you should absolutely feel free to research every other possible remedy available, but the chances are that you will still come back to a simple trading plan. It's understandable for traders to feel fear when they are trading.
The problem is that this is where traders are most likely to succumb to overconfidence bias. It's not uncommon for traders to complete a winning streak and then believe that they can't get anything wrong in the future. To believe this is of course unwise, and is only going to end in failure. Make sure you always analyse your trading sessions and look at your wins and losses in detail.