Can your CEO speak better than Jon Stewart at the Oscars?

I didn't watch much of the Oscars. It was a bad movie year--the ones I enjoyed weren't nominated for hardly anything and the ones that did likely won more for their appeal to the liberal glitterati of Hollywood than for their artistic merit. I've heard that Jon Stewart didn't go over well as host, which is somewhat surprising to me--but Bulldog Reporter has pulled out some lessons that PR practitioners can glean from his example:

1. Don’t assume your client who speaks well in front of 20 people in his or her own conference room can make an instant transition to speaking in front of 100 people in a convention center.
2. Don’t assume your client who speaks well in front of 100 people can make a smooth transition to speaking in front of 1000 at a trade conference.
3. Help your clients get conformable with the size and sound of the room by rehearsing in the same room where they will be giving a speech.
4. Any new technical equipment (e.g., wireless mics, TelePrompTers, lights) needs to be rehearsed with in advance—not used for the first time in front of a real audience.
5. Help your clients build their confidence levels by exposing them to increasingly larger audiences—don’t make them jump from an audience of five to 500 in one presentation.
6. Rehearse, rehearse, rehearse (and do it with video).