That was some really great advice and I like the fact that he kept coming back to confidence. Confidence in your subject, your ability to deliver and in the quality of your presentation is key.

One thing I would add though is regarding visuals. If you present with a slide deck make sure there is an absolute minimum of words on each slide. People will read every slide you put up, and while they are reading, they are not listening to you. The human brain just isn't modeled to be able to handle listening to one thing, while reading another.