Cutting my own hair, I've screwed it up a few times now. My favorite was when I was just going to give it a little trim, but the guard popped off of the clippers mid-stroke and took a huge chunk out of the side/top of my head. So I was rocking a buzzcut for the first time in 15+ years. Turned out I liked it once I got over the shock, so I've been doing it intentionally ever since

It's just hair, it'll grow back eventually.