I think you are over analyzing your situation.
While competition is an important part of martial arts, promotion is not based on winninng and loosing (or it should not be). The important part of competition is to test yourself and your style. Just because you don't win a match, doesn't mean your technique is wrong or bad and you will always come out with more experience than you had going in.
Relaxing before the fight is probably the best thing you can do at the moment if you have already prepared a strategy and techniques.
Will you let us know how it goes?
and for my own curosity, which kata are you doing?
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