Psychology is very useful for maintaining the right trading according to plan so it's not everywhere because there is a way. But in my opinion psychology can be trained with discipline, meaning that if it has been hit, please cut Loss, but take a profit out of the market and never ever the time before, it can danger. Patience is part of learning and discipline is the result, psychology is real in determining a trader capable of surviving or not. Don't be ignored but look for benefits and do it.