stop living in your head ,its wrong it can easily make you choose wrongly and flamed up the greediness in you,proceed with caution always
All of your decisions will have to be made with your head but the important thing is to make thoroughly thought out decisions and then to stick with them to a large extent. If you let every price movement get to you then your mental health will suffer and trading will feel like a chore. It should be fun, exciting and rewarding.