We just began by taking short drives through the countryside and building our confidence as we went. Practiced turning and backing in a bank parking lot when it was closed. Practiced driving on two lane roads... had dots on the inside of the windshield to indicate the right shoulder and center line. Soon found confidence to watch the road and not the dots. We were told that once we had a motorhome, we'd never look at a gas station the same way again... and we don't. Even driving a car, when I pull in, I imagine pulling in in the RV and how I would get out again. Congratulations on your unit. Have fun with it. The videos are helpful, but practice that gives you experience is where your confidence will come from.
The LAZDays videos were very helpful and start with adjusting mirrors.