Probably not who you're wanting to respond lol but for my high school capstone class I was a TA for a middle school math class and a science class. I didn't do a lot of teaching but I did some and I did a lot of talking to the class (like telling them to quiet down or that we were going to play Kahoot) Confidence really is key. If you act nervous about it, they're going to act weird about it. Depending on how severe you're case is, possibly bring it up. Depending on the age you could do it when you introduce yourself or after you stutter the first time. If you don't want to bring it up to the class or even if you do, be prepared for students to respond poorly to it whether that be interrupting you, completing your sentences, or even full-on teasing you. Overall, act confident about it. Pretend it's as simple as having red hair. "Why is your hair so orange?" "I have red hair, I was born that way." This works for me so hopefully, it works for you :) Good luck! Teachers have a gift that I envy. W/ other teachers you could try to casually bring it up like saying "Ooof I hope my students react well when I tell them I have a stutter." If you're a student teacher, definitely tell your teacher you are under (idk what to call them).