I cut my own hair. I stopped going to salons about a decade ago, because every time I went I came home and found myself still fiddling with the cut. I never found a stylist who could really nail what I wanted, so I figured out how to do it myself.
I'm still not the most efficient hairdresser in the world, but I have my go-to styles down pretty well (a choppy pixie and a somewhat Sassoon-ish bob). Short hair requires a fair amount of maintenance, so I trim the bangs and the back every 4 - 6 weeks. After DIY'ing for so long, I can't imagine getting maintenance like that done professionally, for both time and money reasons. If I got it into my head that I wanted something really challenging and experimental, then I would go find a stylist to do it for me, but for the most part I just like my hair to stay out of my way.
The key to success is having a good double mirror set-up so you can see the back and sides easily. And going very slowly at first. You can make it shorter, but you can't make it longer! If I get a chance, I'll post some photos tomorrow.