Quote from cashcarewins:
Stop management is certainly the most difficult aspect of trading. I know I do a terrible job of it. Set stop, cancel stop, reset stop, be thankful for a minor retrace to get out. It probably works out for me in the sense that the net losses are probably about the same. But I think the bigger issue is that by (mis)managing stops you lose focus on the market and often deprive yourself of the opportunity of entering a better trade later.
I know that in my trading one of my problems is that when I enter a trade which goes against me 3 or 4 ticks, I get nervous but am willing to let it work out. If I'm still open after say 15 minutes but it's near my entry still, I get very nervous. Then if it starts to go my way and I'm in profit 3 or 4 ticks, I have a tendency to want to close it ASAP because I feel like the market has given me an opportunity to get out after being in the red for so long. But it's usually at that moment that if the trade still looks good, that I should give it even more leeway to move my way, instead of being so quick to want to get out alive.

