Welcome to the forum! Great advice here. We all have stories and you will,to after a few trips. You learn as you go (see my tagline).
A little nervous is good. The wise RV driver is hyper aware of the edges of his rig, and the obstacles and traffic all around. With a longer wheelbase, it won't turn like a car, and watch out for the tail swing when you turn. (You wouldn't be the first to wipe out a gas pump, don't let that happen!)
Enjoy your journeys and remember to share here!
Bad decisions make great stories!