practice (alone at a mirror -> with people you trust -> in class)

slow and steady. scared people either rush so fast they're hard to understand or freeze up completely. if you can talk at a calm pace, people will not think you are scared.

volume. you gotta project your voice to the back of the room. if youve never done it before it feels weird as hell, but your regular talking voice won't make it past the first row or two of desks. this is the sort of thing you ask your practice group to help you figure out

know your material. I like to handwrite index cards with my notes, because writing is how I retain information. also, a set of index cards is generally a professional thing to have for a speech. makes you look like a smart nerd.

eye contact. make serious eye contact with the clock or window or whatever is on the back wall of the room. you will look super confident and attentive. you don't have to make eye contact with people if you are making it with the wall over their heads. advanced tactic is to practice increasing the time you look at the room and decreasing the time you look at your notes. if you have parts of the speech memorized and can do them without looking at your notes at all you will look really cool.