I remember my skul days when I had presentations or had to deliver a speech, I was really terrified from the time I was assigned the task till completion ! I kept repeating the speech almost every minute of the day inside my head, wherever I felt I wud stop at a word, I wud replace it wid a synonym ( dats how my vocab grew ! ). Even in sleep I was repeating the speech till the tym it got perfectly fluent in my head. But no matter how fluent I was in my head, when the tym came I couldn't even complete a sentence without stopping. Speaking is itself a challenge for stutterers and public speaking is a f*ckin boss level ! Kudos to u mate, for completing ur presentation, it's tym to rest now !