Tell them in the beginning that you have a stutter. And don’t consider stutter a disability, just think that’s something that makes you unique. I had an interview where the interviewer told me “I’m sure that it’s not easy to live with this problem” and I stopped him and said “it’s a not a problem, but a thing that makes me unique”(unique, because if I add all my qualities, also my stutter, but also all my less positive things, this makes me unique)and he was speechless for several seconds. Let them know at the beginning of the interview that you have a stutter, but it’s not something that makes you less valuable compared to other people. At least for me, when I’m telling them in the beginning that I have a stutter and I want to explain what stutter means in a few words, my mind goes chill and I don’t even stutter during the interview anymore. Don’t let the stutter to define you.