In my last post on presenting, I meant to mention the Question Conundrum and added as an update but then deicded it was worthy of a post of its own.
Q: What is the Question Conundrum?
A: Most people hate the thought of presenting as they'll be asked a question they don't know the answer to and be made to look stupid in front of a crowd.
This is simple to get over - if you think anyone in the audience can trip you up on the topic you're about to speak about, you should be questioning why you're up there presenting. If you genuinely do get asked a question you can't answer, just tell people you don't know but will find out. People value honesty from their presenters. One sniff of a presenter who isn't quite on top of their topic and people will move in for the kill. This can be mitigated by having built a rapport with the audience but once your ship is going down people will see you starting to bail water.
As always, Garr Reynolds has some great supporting material.