Again, we should not aim for professional trading what we need is to find out what's the strategy we can use in our trading. Because the profits we are targeting are depends on our strategy which we have thought thoroughly which should give us confidence on our trades. Though, there can be occurrences that a trader become greedy.
I think that the confusion arises when the main motivation is to go after the high profits without having a good and tested strategy that can produce those results. This is where there greediness comes in because a trader will then try to stretch their profits in anticipation of making those profits at any opportunity they get.