While it doesn't really help you, please be aware that MANY of us are in your exact position!
I don't know about the OP, but this does help me tremendously. Being the only person in a room of 60-70 that realizes it's a cult is an extreemly lonely feeling sometimes, but knowing that there are dozens on this site, and likely tens of thousands out there who are with you in spirit is a powerful bit of knowledge.
If you don't have a tablet, get one. I've got a running document that I keep all my research in (i.e. WT articles where they flip-flop on organ transplants, etc) and I update it during the WT study when something useful comes along. I look for things that I can twist to my advantage (like the WT study a while ago where it said to reject unscriptural teachings regardless of the source) and I look for logical fallacies (they're everywhere!) and other bits of proof that this is not "god's organization." Everyone around will just think you're taking notes.
I also like to read/post on JWN while I'm running the microphones. Keeps you sane and innoculated from the propaganda while at the same time giving you a healthy dose of adrenaline at the possibility of getting caught.
I do the same thing as Justnowout with the songs, except I usually change the lyrics to things that are somewhat more vulgar.
During prayers, I never close my eyes and bow my head (unless I'm falling asleep) but instead I usually look around for other people doing the same and wonder if they're awake. There's a couple kids in the hall that seem like they might have a head on their shoulders, and they seem like they may be waking up too, so that's always encouraging to see.
In general, try not to participate in any communal activities (singing and bowing your head for prayer are the most obvious ones) as this participation will trigger an unconscioius psychological effect (a form of cognitive dissonance) that will make you sympathize with the JWs more. While there's probably little chance that you'll get sucked into believing that it's "the truth" again, it will help you keep a clear and objective mind and stay focused on what's important - getting out.