How hard are these RVs to drive?

At 30ft you will feel like you are driving a van. In most cases your Class C or Class A will drive just like any other vehicle, and probably a lot easier than a U-Haul (not knocking U-Haul) but for kicks you can rent a large U-Haul and drive it around the block a few time....an RV will be so much easier as the steering and suspension are designed for comfort not utility. At 30ft even 32ft you don't have much of a rear to worry about and the coach will track just like a van. You are wider, but you get used to it real fast. You accelerate slower and stop slower, so you learn not to pass and to leave plenty of space in front. In our family I drive, my wife drives (probably better than I do) and all my adult children take and drive the motorhome.
Enjoy, and Happy Trails.