O'Malley Drysuits just aren't that big of a deal. They are different. You must do your home work. I read all about them before diving my first one. If you had someone coach you on fit, you know how to do a tuck and roll drill and use only enough air to offset squeeze, you'll be okay. Do try it out in the shallows. Anybody who has actully dove knows that bouyancy in the first atmosphere is the hardest to master as it has the most change. You might get around BS, but you'll never escape physics. Read the books, get wet and get experience. I'm planning on showing up with Moneysavr and I'll be happy to coach you through. no worries.
Jim
Jim