For psychological setup, you'll need to learn the basics of self-hypnosis. Many use this method intuitively. The most common and effective is to convince yourself that you are winner and you are bound to win. This method will be effective not only in the case if it is combined with a high level of technical, tactical and physical training but with certain qualities of character of the athlete, which should be always result oriented and ready to achieve his goal under any circumstances.
Another way is to suggest to yourself the idea that the upcoming contest is insignificant and that the results of his secondary. It helps to relax and not strain psychologically. On the other hand, the athlete motivates himself on the result, and this indifference, of course, may affect his speech.
The third way is to suggest to yourself the idea that you have to show your technical, tactical and physical potential regardless of the circumstances and character of the competition, enemy forces, possible outcomes. This method is fraught with excitement and inadequate assessment of what is happening. In this case, the opportunity to speak unsuccessful, is quite large.
Some athletes use such techniques as anger and hostility to the opponent, creating the illusion of the weakness of a partner or trying to completely distract from the upcoming competition. But such methods are controversial and not always can help to achieve the desired mental attitude, some of them contradict the ethics and unacceptable for a person in harmony with the outside world.
To easily distract yourself from thinking about the unfavorable outcome of the battle, to relax and calm down, you must learn to control their condition taking into account individual characteristics. Here the athlete will help those who know him well enough: a coach, a psychologist, a doctor. Taking into account personal qualities - attention, perception, willpower and desire to work on themselves - they will find exercises to release the mental state of the athlete.