thing is I don't quite see how a person could screw this up. I used to cut my own hair with scissors and a mirror and never embarrassed myself. clipper guides. clipper guides!
my one trepidation is that I do have fine hair so if I found that it wouldn't stand up to the clippers I'd have a problem. but not one that I couldn't fix by going to the barber.
wash it first. think about it in the shower.