You should know that witnessing to a JW is like adding oil to a fire, if you want a bigger fire than by all means add the oil but if you wish to put it out then don't. You should also know that your idea of using only the bible will be at odds with which bible you intend to use, remember the JW's have their own bible and they do not really accept other translations or transliterations. What you are headed into is a war of doctrine and doxology. Bearing that in mind it should be remembered just how many schisms have occurred in the Christian church since the very beginning, which is why Christianity is considered to be the leading religion in competing creeds and that old and new hetrodoxies are ever evolving among protestant churches.
Tucker
But again it is the absurd and its contradictory life that teaches us. For the mistake is thinking that quantity of experience depends on circumstances of our life when it depends soley on us.
Albert Camus: The Myth of Sisyphus, translated by J. O'Brien, copyright 1955 by Alfred A. Knopf