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[0] 6 [Tip] Prepare [Don’t] Don’t read off a piece of paper. Your audience will zone out and stop listening to what you’re saying, which means they won’t hear any extra information you include. Instead practice your presentation and connect with your audience. Rather than typing out your entire presentation on a piece of paper, practice and let images, main ideas, and keywords remind you of what you are saying. Engage your audience by sharing the details out loud. [Do] 
You can always tell when a presenter has practiced: slide transitions are impeccably timed, explanations are crystal clear, and questions are fielded smoothly, never disrupting the flow of the lecture. Polished execution captures and sustains interest, and cannot be accomplished by “winging it.”
Lisa Nielsen: The Innovative Educator: 10 Do’s and don’ts to using PowerPoint to deliver lectures that don’t suck
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