It can be a long process. First, find some articles where the society reverses its decisions on things. For example, will the people of Sodom and Gomorrah be resurrected? The back and forth debate inside the Society is amazing.
Next, if you can actually start a conversation about the anointed and how they think they are superior to the average JW. Ask how do they prove that they are.
Another good thing to discuss is when armageddon will begin. JWs have for years said how bad it is on Earth. Unfortunitly for their cause, that is not the case. Another topic about armageddon is the society has mentioned several dates. 1878, 1914, 1919, 1925, 1940's, 1975, etc. I have even heard of 2005 being a posibility.
Unfortunitly for you, there is not an easy answer to your question. I wish you luck, but before somebody can leave the JWs, they must want to leave.
"Hand me that whiskey, I need to consult the spirit."-J.F. Rutherford
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