Easy as pie. Just takes practice. I launch/load alone all the time. Yet I watch people at my Trailer Park struggle to do it, yet they only put their boats in once and take them out once in a season.
I loaded my boat at this launch one day,More of a sand beach really and then rescued a similar sized boat that was about to be sucked into one of those tubes! There was a guy in it desparately holding the rim of the tube, while the current pulled at the boat, and his buddy was getting the car! I had to laugh, here I was loading my boat alone, and these two couldn't do it without me saving their butts. BUT, I launch all the time alone, it doesn't take long to get confident.