Similar situation for me here.
I’ve cut my hair a few times before and from what I can discern, a hairstylist or someone particularly interested in hair/beauty will notice if you’ve cut it yourself. Whether that matters to you is another thing.
I’ve noticed if you have long hair (past the shoulders) and there is a lot of it then you can hide any mistakes easier. Curly hair is also better at hiding mistakes. If it’s straight, short and more sparse then any cuts made will be more noticeable and thus any mistakes will be more obvious. If you go very short and have to use a shaver to get closer to the skin then it can be tricky to keep everything even.
The more you do it the better you will get of course. At this point I feel fairly comfortable trimming my length but the first few times did not look very good. If your situation is such that appearances aren’t scrutinized severely then I don’t see the harm in trying to do it yourself.
Just make sure you cut your hair a little longer than you might want, that way if it looks really bad then you can go to a hairstylist and they have some length to work with.
Oh and something to note, my hairstylist knows about my sensory issues and they’re very accommodating. I was rather upfront about it, telling them something along the lines of “Hey, I just wanted to let you know that I have some sensory issues with haircuts. Is it possible we can address them before we get started?” I ended up sticking with the hairstylist that was the most understanding. It took a few tries but they’re great! We use unscented hair products, no heat styling (blow dryer or hair iron), tv’s are turned off, and we only really talk when it’s about the haircut.
The only reason I don’t see them that often anymore is the cost of services in general.