How to Prepare for a TED Talk: 4 Lessons From a First-Timer

Your first TED Talk is a different beast.

You can be an experienced speaker. You can have delivered hundreds of presentations. But a TED Talk strips away your slides, your notes, your safety nets. It's memorised. It's performed. It's filmed from five angles.

Keith McCormick is a LinkedIn Learning instructor with over 290,000 learners. He's spoken plenty. But when a speaker dropped out and he got 48 hours to pitch a replacement talk, he discovered TED demands something different.

"Friends told me it would be one of the most stressful things I'd ever done," Keith said. "That seemed extreme. But it's probably true."

Twelve weeks later, he was on stage. Here's what actually helped.

1. Aim for 8 Minutes, Not 18

Here's something most people don't know: the 18-minute TED Talk is basically dead.

"These days, there are still talks that are 18 minutes, but everybody's attention spans are shorter," Keith explained. "Everyone who has done multiple talks gives the same advice—you want to be more like eight minutes."

The hard limit is still 18. Go over that and TED will chop your talk without asking. But the sweet spot now is closer to eight.

Keith ended up at 11. He'd practiced it dozens of times at exactly 10 minutes and 15 seconds, but nerves stretched it out.

2. The ChatGPT Memorisation Trick

This was the technique that surprised everyone in Keith's network.

"I would put the script in ChatGPT and have it remove like every fourth word, but at random. So I'd have it remove 25% or 33% of the words, but at random."

What does that do?

"I had holes in the script, but I realised I could read that like a teleprompter with all those holes because I knew it well enough. Every time I practiced it that way, it left different words out."

A line like "I still remember the day vividly when everything changed" becomes "I still remember ___ day vividly ___ ___ everything changed."

If you know your material, you can fill the gaps. If you can't, you know what sections need more work.

Keith wishes he'd discovered this earlier. "If I had come up with that four to six weeks before, I think it would have worked. Eventually I could have had it remove half the words at random."

3. When You Mess Up, Say This

Keith hit the wrong slide during his talk. A cat was supposed to appear. It didn't.

"I just stopped and said, 'I'm just going to do that again.' I was talking to the editor, basically."

He learned this from recording LinkedIn Learning courses. When you lose your place, you just say "rephrase" and go again. The editors cut it out.

"The organisers said I handled it perfectly. That's exactly what you need to do. It makes it so easy to edit later."

Here's what surprised Keith: the audience leaned in when he made the mistake.

"What they tell you is that if something like that happens, the audience immediately pays more attention because they want to cheer you on. They want to make you feel more comfortable."

You can pause for 30 seconds and no one will care. Everyone wants you to succeed. Then the editors clean it up anyway.

4. Keep Your Slides Mostly Black

Keith's slides were almost entirely black screens. Images appeared only when the audience needed help picturing something unusual.

"They kept telling me: if you're telling a story and you have a picture, why? If you're talking about a bookstore, why do you need a picture of a bookstore? Everybody knows what a bookstore looks like."

Only use visuals for things the audience can't picture on their own.

Watch Keith's TED Talk

Keith's talk explores how AI can help with one kind of intuition but not another—a fresh take on the "will AI replace humans" conversation.

Watch Keith's TEDx Talk on YouTube

Frequently Asked Questions

How long should I spend preparing for a TED Talk?

Keith had 12 weeks total. He spent 8 weeks getting the title and pitch approved, then 4-6 weeks on memorisation and practice. Most speakers recommend having your script locked at least 6 weeks before so you can focus entirely on delivery.

Do I need to memorise my TED Talk word for word?

Yes. TED Talks are performances. But "memorised" doesn't mean you can't have backup—Keith kept notes accessible. The goal is to deliver it naturally while having a safety net.

What if I make a mistake during my TED Talk?

Stop, say "I'm going to do that again," and restart from a clean point. The editors will cut the mistake. The audience will root for you. It's not the disaster you imagine.

The Bottom Line

A TED Talk is one of the most stressful things you can do as a speaker. It's also one of the most powerful credibility builders for your expertise.

Keith's advice: aim for 8 minutes, not 18. Use ChatGPT to create fill-in-the-blank versions of your script. When you mess up, just do it again. And keep your slides black.

The audience is on your side. So are the editors.

Want to build authority beyond the stage? Learn about building authority through content or explore the PACE framework for content clarity.

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This post is based on a TTV coaching call with Keith McCormick, a data science instructor and LinkedIn Learning author. You can find Keith on LinkedIn and watch his TEDx Talk.