Watch your overhead clearance. You're used to driving your TV and not worrying about tree limbs and such, the AS is much higher. When we brought our AS home there was a small limb stuck in the Zip Dee awning and a few scrapes on the front cap that came out with a little Walbernize wax. We were lucky.
My wife is the ground guide. We tried walkie-talkies but she's technically challenged, so she just yells (make sure a window is open
). Stop and go walk the area you're going to back into so you know about overhead stuff, dips, soft spots, etc. Go slow and listen for glass breaking.
Go slow with everything, especially the road. I run about 60-65 because I get better gas mileage, I'm within the max speed for ST tires (65), the rig handles better and riding in the slow lane lets me enjoy the trip as well as the destination. "I'm retired, I ain't in no hurry no more."
Take all the manuals with you. The PO of our trailer gave us the Airstream tote bag with lots of reading material. It's the perfect time to read about the equipment while you use it. There is a LOT to learn, like the crossover valve on the hot water heater, turning on the furnace / AC, using the stove, holding tanks, toilet, etc. Learn about the WD hitch and its nuances.
Read this forum and you'll learn about stuff even before you knew it existed. I can't tell you how valuable it's been. Everyone on here is extremely helpful with quick responses to your questions. That includes not only the mechanical aspects of Airstreaming but "Life on the road" as well; very important.
Finally, know that things will go wrong, eventually. One of my favorite saying is from Major Sidney Freedman on the old M.A.S.H. TV show. "Sometimes you just have to pull down your pants and slide on the the ice". Take it easy, mull it over, discuss it and then take your best guess on how to overcome it. Remember, it's supposed to be fun, enjoy it.