Not even a newbie yet - but thinking of trying

I would rent the 33' so that there is plenty of room and she is comfortable. (we live in our 36'- good size) and I would also suggest that you educate yourself a little bit on hooking up the sewer, dumping or anything else you might wonder about so that it isn't a big deal to do any of these things you may need to do. The smoother the whole operation, the more you will enjoy.