First of all: Congratulations!! Being the one out of 120, that's a pretty solid "you can do it" in my book. I'm not one for inspirational battle speeches but here's some dry pragmatism that never failed to keep me afloat, no matter what carousel was going on internally. My assumption is, given your dream to teach, your professor's confidence in you, and your last sentence, that your stutter is rather on the bearable side, yes? Not a true pathologically hopeless case who's verbally bound to a wheelchair, I guess. So right now it's mostly in your head. You're irrational, and while that's totally FINE in principle, you need to be able to push it aside a little, distance yourself (while of course still being nervous) and free some RAM for function and performance. Most important for function is: Be prepared with your content. I don't know how much you can plan for your lesson, but if so, do the absolute most you can do. Rehearse your script in front of the mirror, an audience of stuffed animals and a clock. Hell, learn it by heart if you're someone who tends to forget your birthday under a lot of stress. And not just that, prepare some transitions, questions, your introduction, pleas to be silent etc. If that stuff sits, you can be super nervous but still fall back to your rudimentary knowledge/methods. This leads directly to performance: If you sail the first few minutes with easy, you will be amazed how quickly you lose that momentary fear. Because right now, you're just anxious of the unknown. After some sentences in front of the class its power dissolves, poof, it's gone. Adding to that, keep in mind some basic cornerstones: It's okay to be eccentric. Sure, some people will snicker when you botch a word but then again, people always snicker. Just accept it for the moment and put it aside to your pile of nervousness. Remind yourself throughout that you always pause for some seconds if you lose your thoughts or feel a wave of stress coming. Ask someone to repeat in their own words maybe but even just reading your script for a moment is totally fine. If someone continues to chatter and ignoring your pleas, just stare annoy in their directing and let some crowd shaming take over. It's not a heartless jury you're facing. And finally, everything that misfires on your first is a learning experience for your second try anyway.