First 1,000 miles I had yellow vinyl tape on the windshield in front of me so I knew when I was in the middle of the lane. Had driven to a large parking lot to practice backing up and aligning myself using the painted parking slots. Prior to that, I followed Class A's, buses, and semis in towns and watched how they turned corners. Just so I'd know how they took sharp turns to make it around a corner. Learned to go way out into the oncoming lane sometimes on old streets, to take my time, to not worry about the traffic I'm blocking (because think about it, we all wait patiently for large vehicles on the road making turns).
And finally, I learned to stop at a corner, watch and wait if the road seemed a bit tight for my rig. If I didn't see any buses or trucks (or RVs) take that road, I'd take a different route. Sometimes I had minutes to make that eval parked on the roadside, other times right at the turn, I'd have to make it quick. But I'd never blindly turn onto a narrow street without spending some time observing other traffic.
With your 5th wheel experience though, you should be fine.
