You mentioned not being involved in any church for a while. I'd suggest a year or more. This is the advice of the best veterans of the board, and after much hard experience, I see why. You have to sort out who you are first, without being bombarded with yet another set of beliefs. It is this stabilization and celebration of the individual that is so important. (Expecting another rant from godrulz on that one. I'll do my best to sit on my hands.).
Now, for HOW to get rid of them, there are"firm but polite" methods, sly methods, and rude methods.
Polite: "I am struggling right now and I need you to respect me as I work it out. I will be away from the meetings for a while....oh all right, you can check on me in a month."
Firm but Polite: "I have issues I have with the Watchtower Society and I have concluded, after much reflection that it is not the truth. Thank you for your time but I am no longer interested." repeat as often as necessary, the "broken record" method of getting rid of sticky sales people.
Great tips: http://www.futurevisions.org/boundaries_Manipulation.htm
Earnest and Hard-Hitting: Pick one brother that you most respect. Invite him over for tea, and ask them to be prepared to answer some questions you have. When you meet with him, look him earnestly in the eye and ask if he is prepared to discuss your deepest concerns? Some preparation is required for this. You will need to recognize bait-and-switch, red herrings, strawman arguments and insist that he return to your concern. Don't let him tag-team by bringing another brother along for support. The conversation is also over if he says he has to do more "research". This research consists of reviewing your concerns in the Reasoning book and WT CD. He might approach a heavy hitter at the hall for answers.
Sly method: Make it clear that you have been associating with apostates, and see them evaporate. Sometimes all it takes is a sheaf of printouts or a copy of "Crisis of Conscience". Fear of the devil is a nasty deterrent.
Avoidance method: Stop picking up the phone. Turn off the ringer. Don't answer the door. If you run in to Witnesses you like in public, be polite but stick to the weather. If anyone says they "Miss you at the meetings", say, "I miss you too. Let's make a date for tea."
I really mean it method: Send a registered letter to the local elder body requesting that you be put on the do not call list. Say you don't have to provide a reason.
Rude method: see below!
Minimus posted a tongue-in-cheek thread on this recentlly:
http://www.jehovahs-witness.net/jw/friends/210173/1/How-Would-You-Recommend-Getting-Rid-Of-Jehovahs-Witnesses