NeMEed, remember that the more water that circulates through a wetsuit, the less effective an insulator it is (because the water carries away body heat). Therefore, the wrists and ankles should fit closely, and so should the neck, and ideally, there's little or no gapping away from your body anywhere. This means that, on dry land, a wetsuit feels uncomfortable, and may feel like it's binding a bit around the joints. Once you are in the water, and there's a lubricating layer of liquid between you and the suit, your mobility is better and you're much more comfortable. If you keep upsizing the suit, you'll reach a point where you are comfortable on land, but likely to get cold in the water because the suit's too loose there. Your shop should really be able to help you choose the right suit -- I would never have bought my original wetsuit without the shop's advice, because it didn't feel good on land at all.
Getting in and out of wetsuits is a whole study in and of itself. Some people use silicon spray to ease themselves in. My husband uses a bottle of dilute hair conditioner and douses himself in that before he tries to pull the suit up. (I just fight with mine.) The less skin you have exposed to the inside of the suit, the easier it is to get on. Thus a bikini makes your life more difficult, and some people even wear pantyhose under the suit to make it slide on better.
No matter what you do, a 7 mil Farmer John is going to be a fair amount of work to get into, which is only one of the many reasons why almost anybody diving regularly in Puget Sound will end up in a drysuit. (Dry suits are warmer, particularly if you want to do more than one dive in a day.)
Don't worry about being a klutz in class. I was hopelessly scuba retarded. (You might get a kick out of reading the journal of my open water class -- the link is in my sig line.) At one point, I despaired of ever being able to swim around the pool without banging into the bottom or doing a ballistic missile imitation. But Tuesday, I got my first cave diving cert. If I can get that far, anybody can learn to dive.
And, once you get your OW card, if you want a steady buddy to do some first local tours with, send me a PM. I like going out with new divers -- I was shown such kindness and generosity when I was new, I enjoy paying it forward.
