Don't be scared. Find a large parking lot and practice backing up and turning around obstacles so you get the feel of how the truck and trailer handle together.
Camping in the driveway is the best way to start. Keep a note pad handy and mark down everything that you have to go back into the house for.
Create a few check sheets, one for getting ready to leave for a trip, arriving at campsite, and leaving campsite. There is even an app called RV checklists that you can customize. These will help so nothing gets forgotten.
My salesman told me that the most important thing to remember about rv'ing is to slow down, relax and have fun.