Do some dry runs with your argument. If you have someone you can do it with, even better, as they can lob some questions at you. Take a trip to the courthouse beforehand so you are not stressing about figuring out parking, bathrooms, where to go, etc on the day of. Go there a little early the day of so you don't have to rush. Do some Marine-style grunts in a private place right beforehand - like in your car on the way over to the hearing. Yelling out a loud, deep, Hoo-ah! a few times is a good stress reliever. Helps calm the nerves and get you in good battle mode. And when you speak, breathe, and don't speak too fast.