I have never once in my life been able to do any type of art. So I never have done commisions but they seem fun. You doing art because you are good and love it and then getting paid for doing something you love. I see how they can get stressful though if you have too many requests at the same time and etc etc.
Commissions should be something fun if art is what you enjoy. If it does become too much to draw, then just close your requests. Don’t take more than you can handle. Aside from that, it’s like taking prompts from other people but getting paid while you’re at it.