Emotions create many problems in every business either at the time of profit,or at the time of loss, but we should have ability to control our emotions to save our amount from loss. The main thing is that we should avoid to greed then automatically we will control our emotions at the time of profit, we should move gradually. So, you need to practice well to be able to make a good profit, you need to have a good enough trading experience to do this and by the time you can control your emotions.