I take xanas before any presentation in class, or any occasion that i feel i will get very anxious, it does help with the anxiety and i stutter less sometimes, but to be honest at times i dont feel any changes at all. I also read that beta blockers are more effective than xanax and a lot public speakers use them, but there is not all lot of sufficient evidence out there, i’m gonna try beta blockers one of these days. definitely recommend xanax if you haven’t already.