Hi WildTurkey. When I DA'd, I did it by letter, a copy to the Society, the Kingdom Hall and others that personally affected my decision. I went all out, citing scriptures, Washington State Law and even Watchtower articles, about five pages in all. The only thing that got paid any attention to was the last line, that I could no longer allow myself to be associated with the JWs and the fact that I forgot to actually sign the letter.
Of course, it was announced immediately. Then, I received a certified letter asking for my signature. I ignored it. Two elders, including the one I studied with, came by a few weeks later, with the letter in tow, asking for my signature. Since they woke me from my nap, I got a bit ornery with them. When they said it wasn't "legal" without my signature, I replied that it was legal enough to announce publicly, so don't worry about it. They pressed a bit more and finally got to "The Faithful and Discreet Slave wants us to get your signature." I just couldn't help myself, so I replied, "if he really wants it that bad, tell him to come by and get it." With that, they literally stormed out the door, with me behind them saying, "come again, nice to see you again, Bob!" (pure sarcasm on my part.)
My point is, don't waste your time writing a long letter and citing scripturtes or Watchtowers, unless it makes you feel better doing so. In the end, whatever you have to say will just be ignored.
For me, I prefer a letter so as to remove any control they may think they have over me and to make it known, as publicly as I can, that I reject the Watchtower Society.
If God's Spirit is filling a Kingdom Hall, how is it that Satan can manuever the ones within that Kingdom Hall at the same time?