Tip from someone who took it last June...
Do not use Kaplan as a resource. Use princeton review. Kaplan makes users 'feel' like they are learning, but don't use actual tests, and their teaching direction is just not geared toward the test unfortunately.
To be honest, I was much like you, wanting to talk to people who have taken it before etc just to know everything I can, but I was surprised how easy going the whole thing was. You'll hopefully be able to relax a little more once you are there. I would say VISIT the place you'll be taking the test. Some places give you huge tables all to yourself, some give tiny paper size desks and on reading comprehension, you need as much room as you can to flip back and forth, and for the answer sheet. Get a place that has a big desk
What are your hardest sections and I can help give tips on them.