Hi there! Been there, lived that!!! I too have a goof friend-neighbor that is a JW. She is a great person, and would always try to "tell me the truth". I too feel immature in my spirituality, therefore, not "armed with my spitital armour" . She would even corner me and preach to me about her beliefs, making sure that I left questioning my own beliefs. One day I decided that I needed to do something. So I prayed alot for guidance, and the next time she brought up the subject, I told her how important she is to me, how I valued  her as a friend, then I broke down and even told her that I respected her beliefs and she needed to respect my beliefs. ~ You know to this day we are still friends and she has not brought up the subject again.

 I dreaded having the conversation, and worried way to much for it to be that easy!!! I hope it is as easy for you as it was me.~~Just remember they are trained to study-study-study their Bibles, they know it inside and out, and they are also trained to make you question yourself. Thats how they get into your head. REMEMBER TO PRAY for guidance. God will help you trough it!

There is alot of wisdom presented here by the above comments.  I only want to add that should the conversation return to discussing Jehovah's Witness beliefs, then I would keep my end of the discussion going by asking questions.  This is disarming and shows a genuine interest to want to learn and absorb what your friend has to say.  And when she's finished, then (in question form) ask her to explain some of those passages that seem to support your own views.  Of course you'll want to brush up on your biblical information, but not much goes wrong when you take the Socratic Method.

    "Can it be, Ischomachus, that asking questions is teaching? I am just beginning to see

    what is behind all your questions. You lead me on by means of things I know, point to

    things that resemble them, and persuade me that I know things that I thought I had no

    knowledge of" (Socrates, quoted in Xenophon's Economics).