I prefer cutting my own hair because I hate it when other people do it and get it too short, or too long and I have to end up trimming it anyway. Besides that, once you cut your hair for so long with the same style, it becomes second nature almost xD
I used to use these actual hair-trimming clippers, but my brother decided he was going to play with them and they were doomed to a horrible life of . . . Dullness. Now I have to use my own scissors that I hide in my room ;w;
I recently cut my friend's hair, and dyed it. I think it turned out pretty nice, and she liked it, but it was definitely rough. It was fun and terrifying at the same time.