Since you are in CA, keep in mind over 40 foot and you are supposed to have a class B license. The CA DMV still calls it a "house car" license.
The very first time I drove a large class A was a 40' Bluebird DP. I was at a large RV show in the middle of a big city. I had driven many class C motorhomes before, one 5,000 miles and one small 32' class A 2,500 miles. All of those were easy. The class A Bluebird on a packed crowded street and then straight on a busy freeway terrified me. I just did not have a feel for the size of the rig. My point is that I would recommend you test drive for the first time in a less crowded area. After an hour it feels comfortable.