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.
Imagine a trader who expects interest rates to rise in the U.S. compared to Australia while the exchange rate between the two currencies (AUD/USD) is 0.71 (it takes $0.71 USD to buy $1.00 AUD). The trader believes higher interest rates in the U.S. will increase demand for USD, and therefore the AUD/USD exchange rate will fall because it will require fewer, stronger USD to buy an AUD.
Since the market is made by each of the participating banks providing offers and bids for a particular currency, the market pricing mechanism is based on supply and demand. Because there are such large trade flows within the system, it is difficult for rogue traders to influence the price of a currency. This system helps create transparency in the market for investors with access to interbank dealing.