On my opinion, 2 factors have to be fully complied to be successful in trading:
1- FLY LOW: personally, I don't gain much with Forex (on current month of August I'm in pair) but I currently do not expect fantastic outcomes from it, a monthly +5% should be the target to be hit to be happy - definitively not a daily +500%!
2-CONTROL YOUR EMOTIONS: place your order then... forget about it. Let it work, keep the gain or stop the loss.
I am aware that the above 2 points are easy to be told but difficult to be followed. Anyway, these are key factors I personally try to be stuck at.