How Long a Learning Curve Driving a Class A

The rear extending beyond the wheels is my biggest fear. When we were younger, we borrowed my wife's grandparents class C and took it to a lake in North Texas. We were parked next to some trees and when I left misjudged the distance when turning out of the spot and heard some scraping and knew I didn't do well. Got out and oh my goodness about 7 or so feet was scraped terribly. I almost just wanted to take off and hide somewhere, but luckily the wife's grandparents were very understanding and knew there would be the risk since I hadn't driven one before.

However, if I do that to something I own, it is on me. I know I can probably do it since I have a lot of driving under my belt now, but just a little nervous about the past.