Quote from FA007:
You need to have two exit strategies before you go into the trade, plain and simple. One for when the trade goes negative and one for when the trade goes positive.
Most lousy traders don't enter a trade with an exit strategy, which is the most important, and if by LUCK the trade goes positive, they sure as hell don't have an exit strategy for that scenario, so they either get out too soon or watch their profits sky rocket and then plummet back down. On the other hand if the trade goes negative early on, then they are left on an emotional train wreck praying to the gods for the trade to go their way with no exit strategy in place, they then most likely randomly exit the trade after a huge loss and the cycle repeats and repeats.
A plan and discipline are needed get out of trade if it goes against you, because the trick here is to cut losses and let the winners run. Obviously you DON'T want to have a string of small loses with no winners, if that's the case then look at yourself in the mirror and ask yourself WTF I'm I doing wrong here. Regardless, let's face it, you can't be right all the time. There's too much risk in not having a stop loss or getting out of a trade after it goes negative and sorta riding it down because you think it might go back up, chances are that it won't, so why risk it and if it does go back up then it's probably just LUCK, which is often the case in most sideways markets, I mean who can predict that stuff. LOL Trading is complicated, but it get's more complicated when you go into the battlefield with no plan and no discipline.
So yes you can use stop losses or not. Just make sure you have your two exit strategies in place and you monitor the trade closely especially if your not using a stop loss.
I know this is a whole other subject, but it does get trickier when the market is more volatile because your stop loss can get hit randomly for no apparent reason only to swing up in the direction you had originally predicted, but that's the nature of side ways markets, be cautious with them.