Human nature is greed, when you are able to control that feeling, you have nothing to lose when trading. i have a friend who is not very good at analyzing the market but has a very small percentage of losses when trading, he said that controlling greed is my success key.
That's good for him, he knows how to take profit every time that he's on it. I agree with him that controlling it is one of the factors and having it combined for being good at analyzing will make the best out of it.
Controlling greed and knowing how to read the market will give you the advantage that others are wanting to have. If you lose, that's okay because it happens but it should be not that much.