When I started trading , in my mind always I was getting negative thoughts (or thoughts which made me to reverse my decision) , I saw a article about trading psychology where he had mentioned that before stating trading do meditation for few months as it really changes the way of your trading , after that I started meditation now after 3-4 months , I am able to control negative thoughts and my concentration as improved a lot
I think emotional control does not need to do meditation. We just need to be rational and persistent. Make a perfect plan for everything. set profit goals and limit losses. You will get a great portfolio.