The most tricky part so far I've found is getting into the damn thing!
Especially when you've only got a very few seconds to get into the thing, shut the door, and start the engine, before the wind blows it the wrong way. (Cheating is allowed - it's not against the rules to switch on the master switch before you untie the mooring rope, push off from the jetty and jump aboard, thereby saving yourself a second or so.)