I have a small boat, and I dry-sail: it's possible to single-hand but launching really requires two people, as does racing.
Well, can't help you with how to deal with obnoxious crew for racing but in addition to a 42' sailboat I also have a 20' ski boat and previously a 25' speedboat, both of which I launched singlehanded all the time.
I just tie a rather long bow line on the boat and tie the other end to the trailer. Check drain plugs, loosen all straps, hooks, tiedowns, etc. Back in, tap the brakes, boat slides off the trailer, I run back, grab the bow line off the trailer, tie boat to dock/tree/beach/whatever is available at the ramp. Go back to trailer, park it, then back to boat and go.
Coming back first tie up the boat. Go get trailer and back it in to loading depth, get boat, power onto trailer, hook up trailer winch, crank in, hook up safety lines, pull out and away from ramp, install straps, pull drain plugs, etc. Drive home.