intimidate me without my permission". When you are a presenter you are in charge. The audience generally accepts this, and you are within your rights to control anyone who does not.
3. Remember also that "Depth of conviction counts more than height of logic, and enthusiasm is worth more than knowledge", (which is apparently attributed to David Peebles, about whom I have no further details - please let me know if you do). Passion is therefore a very powerful component in any successful presentation.
4. Good presenting is about entertaining as well as conveying information. As well, people retain more if they are enjoying themselves and feeling relaxed. So whatever your subject and audience, try to find ways to make the content and delivery enjoyable - even the most serious of occasions, and the driest of subjects, can be lifted to an enjoyable or even an amusing level one way or another with a little research, imagination, and humour/humor.