I got married 2 weeks ago! Same fears you mentioned going into it and I’d consider myself a situational or mild stutterer (I get blocks). We did “repeat after me”like vows. The emotions were strong and slightly distracted me away from only focusing on my speech, and I pulled it off without a hitch! I believe what also helped me was that I was soft spoken, I used a different voice register than my norm. I was also crying a bit soooo…😂 I’m so glad that it’s over, but I’m so glad that I did it. YOU CAN DO IT! Let the present moment and emotions take over your thoughts, not your speech.