There is a saying: Failing to prepare, is preparing to fail_ This is a geat motto and one to live by: Before an important presentation

1. Prepare and Rehearse,
2. Memorize your opening, use some humor
3. Practice your speech from written notes but then look at audience not notes
4. Practice presentation flow by reading aloud and listening to flow
5. The power of silence is helpful, especially a nice pause before answering a question
6. Have a backup plan as there may be some disruptions, keep the flow going, a casual conversation with the audience even if presentation needs to stop for a while
7. Arrive early and dress conservatively
8. Use physical props for a demo, make things interesting!