Lol.
no matter how you prepare, you are going to have a huge adrenaline dump when the fight starts. my hands are shaking right now just thinking about it. best of luck to you if you do in fact have the moral high ground.
i know a lot about fighting because i train in MMA. there is nothing meaningful you can do in a short period of time. im a typical out of shape gamer (the skinny version) so it took a while before i was even in good enough shape to handle the drills, let alone roll with other students. (rolling means wrestling, in the same way that boxers "spar".) all the technique iv learned is based on muscle memory and practice, whether its striking or grappling. against any random person off the streets, i could probably submit them after they took me down, but against the fine athletes that train at Team Irish, its allways a huge challenge.
Dont underestimate your opponant, even if they are a pussy or a fat fuck.
Stay moving, especially your head.
Keep your hands in front of your face, but not too far out in front of you.
Dont try to do anything fancy. Utilize your killer instinct.
Dont listen to what anyone tells you.
Dont fight if there is a better solution to the problem than violence.
Learn as much as you can from the experience after its all over.