Hey , don't worry you will do good .First try to stand correctly and be comfortable physically and to appear confident even if you're stressed... try to relax your body and muscles talk like a person who is sick without a lot of effort ... talk slowly and try to talk with a rythme like you're singing your speech ... try to enjoy talking ,speak with enthusiasm (its like you're playing a role )... try to focus on the phrases and words when you're talking and not to think about stuttering or people's reactions... repeat positive affirmations before " it's OK if I stuttered... who are ppl to judge me! ...I'm confident..." Imagine yourself doing great before ... and you will act the same automatically... I hope you can understand my ideas English is not my first language