Get access to the room where you'll be presenting. Practice, practice, practice. Use the space in the room. Most teachers / professors don't stand in one spot. Feel free to move about the room. It keeps the audience engaged. You command their attention. It also allows you to turn your back to the audience for brief periods as you walk from the back of the room towards the front. Using the space in the room takes you out of the deer-in-the-headlights position. I once closed a classmate's laptop while he was playing some game during my presentation. As I was moving around the room, I passed in front of his table and shut the lid. His 'wtf?' expression was priceless. i.e. own the room. Don't read the presentation. Know it. Make sure you're a subject matter expert on what you are presenting. If you omit or skip something, move on. You can circle back if you like, or not. Look at this as an opportunity. Whether or not you stutter, that 30 minutes is yours.