Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?
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Notes -
Practice makes perfect, but most people only give presentations and demonstrations at most a couple of times per year, so they never get better. Also, only a tiny minority ever record themselves and go back over the recordings to see how they might improve (particularly by excising “uh,” “um,” “er,” etc.).
Relatedly, most people don’t prepare properly. I’ve heard it said that you should ideally spend an hour of preparation for every minute you’ll spend speaking. That may be taking things to an extreme, but a ratio of one hour preparing to 15 minutes speaking has always struck me as the absolute bare minimum. I think most bad presenters just wing it.
“I’ll just wing it” might be more common among extroverts. They enjoy talking to people and assume that those skills will transfer seamlessly to giving presentations (they don’t). On the other hand, some introverts have a deathly fear of public speaking, so they suck because they’re nervous.
Nervous people especially, but also others, talk too fast. Sometimes this is unavoidable if you have to cram a lot of information into a sort time frame (for example), but it’s pretty common even when there are no real time constraints. Talking too fast isn’t great on its own, but it also usually leads to more “ums,” since the brain can’t keep up with the tongue.
Very few people take a systematic approach to learning new skills, especially outside a classroom setting. So even if they think “I’d like to be a better presenter” (which more likely than not never even occurs to them), they’ll never take the next step of thinking “how?” And most people who did take a communications class in college regarded it as a silly freshman blow-off class; it didn’t occur to them that they might actually learn something valuable from it. (To be fair, though, many colleges treat that class the same way, assigning it to any random adjunct who happens to be teaching a lighter-than-normal load.)
Most people are fuzzy thinkers. They include unnecessary details and get lost down rabbit holes when they present because that’s just how they always think. Even with ample preparation time, it probably wouldn’t occur to them to change that aspect of their presentation.
"Just wing it" is such insidious advice, because that's what it looks like all the best speakers are doing, even though they're not (for the most part). The trick nobody tells you is that the best way to come across as comfortably speaking extemporaneously is actually to put a ton of work into preparation. The more you prep, the less "prepared" you will come off as. Authenticity, ironically enough, does not come naturally to most speakers, and requires a higher level of familiarity with your material than most people are willing to put the effort into getting.
But also once you've given broadly the same talk a few times you don't really need to prep it again. Vaguely modify the structure depending on audience interests and time allotted, make sure you're pitching at the right level, slot in a couple of new things if they come up and you're cooking with ingredients you know.
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