Yeah hard work n repititon so that you know you have ticked all the boxes so that on the night you are no questions of maybes and what ifs.
Then your completly free in your mind to be freed up everywhere else and it comes out in all your moves. Your mind/body links all fire freely and you enter the zone and you fight your fight.

Reverse;
Put a few questions into the opponents mind while your in the ring (or before as some try to do) and watch his freedom to be sharp and accurate slowly diminish.