I used to stutter alot when I was a kid well into my high school days. I slowly did start less and less now that Im in university. When I saw your question, I had a flashback on when I was in school and dreading asking the teacher a question. Even if I practiced it a thousand times in my head, I would still stutter when It came to the actual question. I think whats makes a person stutter more is that sinking feeling that I had that Im going to stutter. Everyone's stutter is different so I cant say