If you know that any trade could be a loser, you will always set a stop loss at a fair point. Amateurs often have a tendency to cling to a losing trade praying that it’ll turn around and come right. Sure, sometimes it will , but on the occasions when it doesn’t, you can just go on losing more till your broker closes out your trade because there’s very little left in your account.
Never let that happen! Irrespective of how robust the signals, always set a stop loss. The foreign exchange market is unpredictable at heart and no system is infallible. Sometimes our foreign exchange trading education will tell us to stay with a system thru losses and gains, but sometimes, naturally, there may be a lesson to learn something from a collection of losses. Proceed carefully, being sure to follow all the rules of your system to the letter.
Now and then, market behavior may change in a way that suggests a system stops working for a bit. If you decide that your system might need tweaking, go into demo mode or stop trading for a while and look for more currency trading education.