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
Yes, this is essential, but for some people like me doesn't need any of this because we can truly take care of our own emotions against trading and would perform not perfectly but well.