You will only realize you being greedy when you lose the trade because of greed or simply chasing the pump when its already about to dip.
Funny to know, yes this is only when you know. At the time you see your profit gone, that is when you will know but at the time of contemplation, you will not come to the reality of the possibility of not getting anything at all.
Fist management really also involves exit plan to maximize profit.