How new are you to the boating world? By that I mean if you have the basics down (don't anchor in a drift lane, etc) I'd say you're ready for the community holes on the Mo. And if any fancy fiberglass boats get too close, especially blue tillers, bounce a jig off the driver's giant head.
Amen to this. His head is a good target, and with tiny t-rex hands, he surely won't be able to throw anything back.
More to the boating aspect, I don't know that I would tell a new boater to go to the chutes in the tailrace, to earn his chops. It's not exactly Snake Canyon, but things can go south there, in a hurry. Not exactly the place to be, while learning how to not flood a motor, or start a flooded motor.
Maybe learn in a lake. If worst comes to worst, you're only going to go where the wind ends up pushing you. If you have to learn a new boat - or an old boat that's new to you - and you have to be on the river, go upstream from the ramp. I'm fortunate enough to have survived several dead-floats down the Missouri. At least if you're upstream, eventually you'll be heading back to the ramp.
Also, most fellow boaters are not a-holes. If you need a hand, ask. Most will help you, rather than sit back and watch.
Two more things, if you're new to backing up a trailer, practice in a parking lot. If you're new to launching or loading a boat, don't learn at Fox Island, on July 4th. Go on a weekday morning, when the ramp isn't as crowded.