Leak down and compression
 

I am planning a trip to look at a car in the middle of nowhere, fAR from a suitable shop to do a PPI, and I just happened to have bought a set of Snap On Leak down and compression testers in the cases a few years ago off of ebay, knowing some day they would come in handy, and they were cheap.

I have the books that came with the testers, and some basic connectors but I have never used either piece of equipment. Can anyone give me a lesson without being hands on? I can practice at home before I go on my car.