i dont have any trouble at all launching and retrieving on my own. Launching I just back in as usual, un hook, drive off, park at the ramp. half the time I just push the boat off the trailer and drag it to the ramp. Just back the trailer down slightly further for this. retrieving solo, I back the trailer a good bit deeper than if i was driving it on and just pull the boat up onto the trailer. i can usually pull the boat to within about a meter of the winch and winch the rest. Its easy as. I have a redco sportsman and it rolls on and off the rollers easier than taking a crap, and self levels well too. Prior to this I had a quintrex 510 on a skid trailer and the bigger boat is easier to launch and retrieve on my own. When I am with other people sometimes I will drive it on and sometimes I will push it on, depends on the ramp, often just pushing the boat on the trailer is quicker than driving it on.
I dont have a boat catch or anything, and even solo I am probably quicker than most people at the ramp. I absolutely hate waiting for mugs at the ramp who fart arse around, so I pride myself on taking as little time as possible.