The wife and I were just arguing about this very same topic! Because of a Wahl commercial on TV that shows firemen cutting their own hair with Wahl clippers.
I'm mostly bald, with some hair on the sides and a little on top. In the past five years, I've been letting her cut it with a #3 (winter) or a #2 (summer) guard. She never wants to cut it "it's already too short". I argue it's not short enough. This happens on every cut (about every 3 weeks.
So...watching the commercial today, I said, I should cut my own hair like those guys. Now every guy in that commercial had a good head of hair, if I had their hair, I'd look like Jesus. She said they can't cut it right around their ears.
We do have a Wahl set (and one for the dogs - she did them as well).
Over the years, I've had two humorous hair stories. 18 years ago, when I moved to our town, I had a good head of hair and went to the barber. Out tiny little town had a barber named Carl. I walked in, there were 6-7 guys waiting. Everyone was talking about the bass fishing on the Potomac. Hair cuts then were $2.50 from Carl. In hindsight, no one was talking about how they wanted their hair cut. My turn came, I started describing what I wanted, length, block, etc. Carl stopped me and said "Son, do you want it short" That's what we do here, short". I said "yes sir" and he cut it all of with a #2. When I got home, the wife gave me hell, what happened to your hair etc. Carl retired a few years later and I bounced around to a few other shops, but there was no one like old-school Carl.
Five years ago, I told the wife that she can cut both of our dogs hair, she can surely do mine and save the then $10/cut and time/trip. On the first go around, she went "oh-oh" and apparently had a slip up. I remember saying "how bad can it be?". She said bad. One of my daughters came home a short time later and said "what the hell happened to your head". I told her the her mother slipped up. She said you better get to a barber. I popped over to a shop I'd been to occasionally and the barber said "I charge more for fixing screw-ups". She did get better with no more mishaps (and now, at #2, how bad can it get, right)?
Here's what she is working with, I'm the well-fed guy on the right.