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I have to agree with those who say "Don't block the ramp". e always had a driver and somebody in the boat, every thing un hooked, plugs in etc. before getting in line. The driver backed down and the helmsman started up and backed off while the truck was leaving. Elapsed time, less than thirty seconds when the trailer approached the water and as gone. Same thing when getting out, have the winch line extended and accessible, drive/winch on (no power loading) and get out. Under clean drain dry protocols, empty your bilge etc away from the ramp, no dirty or contaminated water back into the lake.
For a fun hour or two, go to a busy ramp and just watch. Some people dawdle, walk back and forth six times trying to remember everything and take way too long on the ramp. Lots of shouting and trying to drive the truck while you're sitting on the boat Others have it down and are less funny to watch, but very instructional. Go again at the end of the day and watch retrievers, too.

It's easier to back up when the machine is on the trailer and can be seen. You might consider a couple of sticks at the end of the trailer to make it easier to see. Driveway reflectors like you set out to guide the snowplow are cheap.