I cut my own hair every weekend. I’m in the military, though (and no, I don’t just shave it). I found that I do it more to my liking (and consistently) than the barbers I’ve gone to, it only takes 20 minutes, I don’t have to pay $30, and I can shower immediately after. I use a 6 (3/4 inch) on top, a 3 (3/8 inch) around the curve transitioning to the sides, and then fade down from there, 2 to 1.5 to 1 and finally .5 (1/16 inch) around my ears, side-burns, and most of the back. Keeps everything clean, I always look good, and I spend about $40 every year or two.