I'e always used clippers to cut my own hair, even before transitioning began, with all the brands I've used, I have not one cut myself. The most intimidating thing about clippers when you first use them is that buzzing sound, but really, that's about the worst of it. I have a set with numerous guide combs and ear trimmers, it's a WAHL, but I've heard some of the Remington and Oster ones are pretty good too. The main thing is taking care of them so they keep cutting good. With guides it is near unheard of to cut yourself nowadays, with older ones it happened at times but it's no longer than common, just be careful around your ears and you don't have much to worry about, though it's also easy to avoid nicking your ears as well. I would say that, when trimming over the ears, hold the top of the ear down and out the way to minimize any risk of catching it and go slowly, beyond that it's pretty easy to clip ya own hair with those things, biggest issue tends to be making sure you don't miss anything, which is when an extra set of eyes comes in handy. Luckily my roommate double checks for me but if you have any friends willing to check over for you then there ya go.