Questions About the VTNE

It's going to be at least 3 years most likely before I will sit for my VTNE but the test anxiety issue I have makes me want to have some questions answered. I know full well that the answers might change between now and then but I appreciate having as much ease of mind possible. What I'm wondering is:

How likely is it to pass on the first try? If you don't pass the first time, when can you try again? Do they charge for each time you retest and how much is it? Where is the test administered at? Is there a "VTNE For Dummies" type guide somewhere so I can read up on the test more?

Thanks for the information!