Though I have been "out of the loop" for a number of years on boat ramps, and have done little trailer towing / backing I still have the basics etched in me cranium (it's easier to pick back up with a longer trailer too) When I splashed mine for the first time just last month I wasn't familiar with the ramp at the marina I went to BUT I did remember that the plugging, unstrapping, setting the motor, etc was all done before paying the fee and getting officially in line. I made the "mistake" of (remember I was by myself that day too) launching on the gas dock side and after parking I got back down to the owner raising hell about a "5 MINUTE DOCK POLICY IF NOT BUYING FUEL". I made it a point to not tie up on that side when retrieving. I've even thought about renting a slip but wouldn't be able to before securing the battery and fuel tank compartment at the very least.
I've watched hundreds of those boat ramp videos, hilarious for the most part LOL, some are sad when anything sinks, especially tow vehicles. They've shown the klutzy side to us all and some of the damages that can be done to other's property that a "sorry man, didn't mean to wreck your boat / engine with my lack of experience" just won't cut it. And yes, I've seen in the flesh where folks will wheel around to the ramp, pay the fee, back down to the water and THEN start loading the coolers, food lockers, skis, unstrap, etc while others have to watch and wait
I've got mine set up (in theory anyway) that after setting the plug, removing the engine brace, unstrapping the stern, unhooking the bow safety chain (see the pic), and snapping on the launch line, once the tires hit the water I unhook the winch and then roll back until momentum floats it off the trailer. I then pull forward a bit and walk the boat over to the dock with the launch line. Retrieval is to sink the trailer then guide the boat between the uprights and pull it up, winch it in place, and away we go to some unpopulated area away from the ramp proper
