Cutting hair using a buzzer (aka clipper) is not only really easy, but also super fast, and once you've invested in a buzzer, totally free!
I used to get haircuts once every month or so for around $20 a pop, which can really add up over the course of one's life. One day I finally drew the line, bought a buzzer and started cutting my own hair and, after a little practice, my friends' hair too.
Here's a video with the condensed info. Read on for the full details.