I've been guilty of wobbling on my bike after a very hard swim (Nations this fall where i think that i drank half the patomic --- ick!!). The funny thing about sprints is that they are either super super competative OR someone's first race. I think that you get the opportunity to see both the best and the worst at that distance. The good guys are too darn fast, so i stick to Oly's thank you very much. I'm still middle of the pack, but the spread is much smaller ... and it hurts less :)
For a sprint - jammers are prolly ok, i race in a tri suit always (at all distances) and its really not flattering or does it make me particurly fast (see mop comment above) but it is the most comfortable for me. Double the comment on t-shirt over jammer ... USAT is pretty tight with their definition of "nudity"
FYI - bike mount and dismount is WAY less accident prone than turn arounds. Ever see someone with zero handling skills make a tight turn?? EEP! Stay out the way of wobblers there. Seriously,
though ... best advice have FUN!!