WATER, WATER, WATER!! stock up in the morning..
You would be surprised. Also, don't lock your knees, while standing there. You actually don't realize how often you do that, and that causes the bloodflow to stop, and you conk out... (go through bootcamp, you see it more often, than not, actually.
GOOD LUCK, and congrats.. I know it will be the best day of your life!
Ray