I really had to give this one some thought…there are so many things to consider. However when it comes down to it, to be an effective presenter one must project a sense of confidence when speaking. An effective presenter is the one who the audience knows has everything “well under hand”.
How do you project confidence when that may not be how you are feeling? Keep a bold face! Audiences empathize with a speaker. If you are awkward, listeners will feel ill-at-ease too. If you exude confidence, listeners are reassured.