I just started squatting in a suit, so here's what I learned...
-Even a looser suit will feel tight at first, so going a little (just a little) too big is probably a good idea.
-I'm taller (6'1") and I can easily get my suit on by myself using suit slippers.
-Squatting straps down will feel normal, with stopping power and a little carryover from the suit, so you probably won't need a spotter and it won't be too weird for you.
-When you start going straps up, consider getting a spotter. The straps (especially if combined with wraps) will have the tendency to pull you forward, and I almost lost my balance on the first day. I had a friend go crashing into the rack the first day he squatted straps up.
My first suit is a Centurion as well. It has been easy to learn and I've really enjoyed it.