1. Actually being very knowledgeable about the subject in question, to the extent that I can offer facts or well-reasoned opinion on the topic on essentially any reasonable question. In other words, not being a junior high school student asked to do a 15 minute speech on a topic drawn from a hat.
2. Not having the idea that the audience expects a correct and immediate answer to every possible question.
3. Not doing every single speech literally in front of 15% of my entire peer group, including all my friends, all the people I admired, and all the people who treated me poorly.
I still hate doing Zoom calls without slides or a screen to share because I can't stand having 20 people staring intently at me. It's just distracting. But otherwise I have no problem at all talking for hours on a topic I know well.
Doing a presentation on Zoom seems kind of pointless as you lose the connection to the audience. I'd rather just assign a pre-record to watch and do a live Q&A later on. More like a Lecture+Tutorial format.
I run into this in the military too. "The person to do the ethics/roe/safety/drugs/mental health brief just called in sick. Two hundred soldiers will be here at 0800 tomorrow. Read fast."