Dear Husker,
Welcome to the board, first off.
Secondly, my advice to you is this,
More than a ''working knowledge'' is needed.
Jehovah's Witnesses cannot be ''logically'' reasoned with, so your attempts will probobly be futile.
It is very hard to explain the Jw mentality, there are many emotional issues involved, that you cant understand, not ever having been there.
I apologize if I have misunderstood you, but I am thinking you arent or never have been a dub, and are coming from a Christian perspective.
If this is the case, then you can do nothing but perhaps, ''plant a seed''.
To these people, you are satans son.
They want to convert you, and anything you say will simply make them more sure of the fact in their minds, you are demon possessed, and bird food.
You are better off to not meet with them, and leave them to learn from the ones who have walked a mile in their shoes...