The key to trading is that you only need to focus on maximizing the smallest opportunity to make a profit because with price movements that are difficult to predict, traders must be able to withstand emotions in anticipation of bad problems later.
You should not be withstanding emotions, you should be eliminating them. No sound trader with a good strategy will see emotion as something they should really be bothered about honestly. Emotions are just like something that would cloud your judgment and can only be applicable to those who really do not have a planned out strategy or knowledge of how to trade perfectly well.
There will always be times when market will go the way you did not expect based on the signals you have, and this is the reason why when you have planned an exit based on stop loss and you are able to stick with it, without any emotion, you will always end up doing good in the long run.