Compression testing is pretty easy.

You just need a compression guage, and someone to crank the engine for you. (Hec a screwdriver accross the starter will do in a pinch). Read the numbers and test done. You will spend longer getting the plugs out and back in then doing the test.

If you dont understand the numbers you get, post them up, and a guru here will give you some advice. If you have a low piston, it will be obvious.