You're responsible for not hitting anything in front of you. Others behind you are responsible for the same in regards to you. Stay to the right (if possible) if you aren't passing, and if space isn't dead wide open, make your moves known so others don't maneuver into you. You shouldn't need TP, because organized rides take a dim view on people relieving themselves in nature en route.

Other than that, not much can prepare you til you do it. It isn't that difficult of a thing to figure out on the fly.