Oh, I should have been clearer about this: When I say "prepare," I don't mean, "write everything down that you want to say." I agree, that doesn't work well for many people, including me.
Rather, I meant that if you're giving a talk on a subject, try to research it beforehand to a far greater depth than you'll actually be addressing in your talk. That way, the stuff that you talk about will seem relatively simple to you, compared with the knowledge that you've accumulated on the subject.
FWIW, I never write any speaker notes. I want the talk to be a natural extension of me and my knowledge, not something artificial that I'm reading, as if from a teleprompter.
Rather, I meant that if you're giving a talk on a subject, try to research it beforehand to a far greater depth than you'll actually be addressing in your talk. That way, the stuff that you talk about will seem relatively simple to you, compared with the knowledge that you've accumulated on the subject.
FWIW, I never write any speaker notes. I want the talk to be a natural extension of me and my knowledge, not something artificial that I'm reading, as if from a teleprompter.