Kids seem to need more hair cuts than adults. I think it's because they have smaller heads. Their hair is growing just as fast, but it looks longer because they are smaller.
My sister was the first person whose hair I cut. My sister was the pretty one; I was the smart one. She figured that even though I was just a kid, I could cut her hair. As I said, she was not the smart one. Apparently, all it took was scissors to cut her long curly hair, and it came out fine.
I first cut Dan's hair when we were in college. We took Spring break together and I spent time with his family, then he spent time with my family. He needed a cut, so I got out the scissors and went for it. It was a little blotchy that first time, but not as bad as the time when he had tried to cut his own hair. There is always a silver lining.
The second time was better, not blotchy, but not stylish either. Now, he and I both love how his hair cuts come out.
I started cutting Daniel's hair not long after he was born, as he was born with some long hair. It looked shaggy around the ears and back from the get go. Bobby was born with less hair, and Thomas was born with very little. Still the ears and back are the places that need cutting the most. Teaching a husband how to cut women's hair is pretty simple, if you have a simple cut. Take a piece of paper, and tape it to your back so that the end of you hair is over the paper. Have your husband draw a line where the bottom of your hair touches. It should be a curved line. Then, move the paper up a few inches and have him cut along the curved line. After a few times, he won't need the paper.
I never think of a hair cut when my husband is at home, so I usually give one to myself. I generally only give myself a haircut when I realize I am tucking my hair into my skirt again. I have long hair. I pull all the hair over one shoulder and note the curve the ends make. I cut about an inch off, keeping the curve of the ends the same. Then, I pull it over the other shoulder and do the same thing. It isn't perfect, but it keeps my hair out of my skirt.
I don't actually consider this a savings, as it never occurred to me to ever pay someone to do this for me.