way to go Matt! I agree with starting small, and I think the key is also not to beat yourself up if you cheat or make a mistake once. I've been there and I learned that it's better to live a healthy lifestyle vs strict rules - the lifestyle version allows some flexibility for an occasional "fun" night with friends out and about. At least that's what worked for me.
Oh, and I think everyone who tries has a positive attitude...or if not why would they do it, right? :)