Hopefully you've spent some time in a large empty parking lot or field getting used to your new setup. I always practice with a new RV to see how it will stop quick, backup and turn...etc. Get a feel for it before taking it out on the road.
Take your time if you have to back into a site. This trailer will take longer to turn than the 15 footer did.
Watch the curbs on the inside of turns, this trailer will track tighter than your tow vehicle when making tight turns.
Make a list of the stuff you need for the next trip.