This video is geared towards the scientists and engineers. But actually the BASIC principles apply to everyone. The first point it makes is this: Can you still make your presentation if the power goes out? Or if your Windows computer freezes up? If the answer is no, you are not ready to give that presentation.
Another point the video makes is about NOT over-rehearsing – my big pet peeve. Do not memorize your presentation because you will sound like a dumb robot. Do you memorize your conversation with your friends? I hope not.
Here is the video: