I cut my own hair! It's amazing. My cuts are someone complicated (often involving layers and bangs), but it's long which makes it easier to cut on my own. I watched a bunch of youtube videos first to try to figure it out. At some point during every cut, I think, "OH NO! It's ruined! Oh no, oh no!" but I've always been able to remedy whatever I thought I screwed up.
For those of you who say your hair is too weird to cut - my hair is super crazy, and I think it helps! If it was naturally gorgeously straight, it would be hard to hide mistakes, but since it's wavy in some spots and super curly in others, it's pretty easy to blend mistakes. However, I dry it and straighten it prior to cutting. I would never cut it wet - that would be really hard.