We've been RVing since 1987, and had 4 different motorhomes during that time. Only difference is our's is not a towable, it's a self-contained bus style. Lot's of fun, good friends and many great memories.
One of the best things you can do, to get good at backing in to RV sites, is to buy some cone type markers in the dollar store or wherever, and go to a big empty parking lot, place the cones in what would define the space of an RV site, and practice.
When you get good at backing in from both a right side approach and a left side, make it more interesting and challenging by adding a few cones to represent a parked vehicle, across from your site. The add some a cone to represent a tree, pole or sign, opposite your site. Do this until you can do it 2nd nature, and you won't be that guy who asks other campers to move their car, truck or rv for you. And don't forget about tail swing when you are pulling out of a place while making a turn.
Good luck; have fun. Safe travels.