First of all, the kingdom interlinear could be ordered through your JW friends for a donation. I'd suggest giving them the donation at the time you request it, as you'd be more likely to actually recieve it
As for being able to help them, much depends on the particular individual. What it basically comes down to is how honest that person is, how much he values actual truth and whether he has an open mind.
The obvious mistake is to think you can somehow prove it wrong and the JW will just leave the religion. Leaving is as much of a process as joining. Plus you will have to get past the JW mentality that will just shut themselves down and avoid you, because "obviously you are not a reasonable person, you are only seeking to "tear down" and its clear you have been given "apostate propaganda""
One thing to remember is that whatever points you can get out, will not likely be forgotten by someone who is sincere. Your words might have results five years from now, as something calls them back to mind.
You need to keep in mind Witnesses know little about their history, and present controversial policies like blood fractions. All possess a book called Proclaimers which includes a fairly accurate, although whitewashed presentation of their history. Most don't really know what's in it though.
This is a fairly large book that perhaps you could request. (again, a reasonable donation would better ensure your getting this publication. Perhaps you could ask questions regarding it, "what is this bethsarim?" "What is this 1975 all about?" "What about these dates mentioned here on page xxx?"
You can get many scans of WT articles on the net regarding these matters. The older WT articles say much more than what is presented in the book. Many witnesses might be surprised to see with what definiteness and certainty things were stated in the past. You could then show how even recently things such as the Generation 1914, education viewpoints, blood fractions were stated with certainty, but have all changed.
Another item to request is the WT CD Rom Library. This contains plenty of publications on it, including the Proclaimers book mentioned above, but you will still want the paper version. This CD Library will be most invaluable to you.
Your biggest problem will be getting past the JW defense mechanisms. YOu have to always appear to be ignorant and sincere. As soon as you appear to be outrightly challenging them, you won't be getting visits anymore.
Further your most honest answers will come from younger witnesses, or ones that don't seem too bright. They haven't learned to "cover" for the organization, and will simply tell you like it is. "No we can't take blood or we will be disfellowshipped or destroyed" versus "Sure we are able to choose whatever medical treatment we'd like."
Most Witnesses are disatisfied with many things today. Many are concerned over the amount of young person's leaving, and the problems and politics in the congregations. Strangely though, most will hide these things/feelings and defend it at all costs.
I wish you well, but I think you will soon see just how limited and powerless you are in helping people realize what seems to be so obviously false. Perhaps you can only drop in something so small, so little each visit or email. Maybe at some point that individual will put it all together.
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