Congrats! I agree with the previous posts... practice, practice, practice and EJ's Rolling and Bracing is one of the best videos out there.
On a separate note, I never knew Ann Arbor had whitewater... I went to Michigan State for undergrad and law school and the closest we got to whitewater was videos... The Red Cedar doesn't exactly have tons of play spots and I sure I wouldn't want to swim in it!
Anyway... good luck and GO STATE!