There was a person who needed coaching but he had two things standing in his way. First, he was extremely talented. Second, his ego believed no one was capable of improving him. He was the center of the sales universe and everyone else were satellites circling him in a worshipful orbit.
He actually believed every good idea was his. A company-wide joke went like this: Your idea must be really good, because Joe is telling everyone it was his. Another joke: “What did Neil Armstrong see when he set foot on the moon? Joe’s footsteps, because he had gotten there first.”
Question: How do you coach a genius? Someone who is infinitely smarter than you?
Answer: You can’t coach them directly because, unless you are a certified demigod (think Hercules, or Perseus), your opinion doesn’t really matter. So you must elicit the opinion of someone whose opinion does matter. In Joe’s case, since he was a salesperson, this respected person was his customer.

What was Joe’s problem? One of them was his presentation style. He presented PowerPoint slides that were crammed with text and black and white photos. As I told him, “Your content, the substance of your presentation, is great, but your style is detracting from it. You need fewer words, more color, movement, embedded videos, things that help make your lively presentation more lively.”
My critique changed nothing. It only hurt our relationship. He thought I was incredibly presumptuous to be critiquing him. In short, he hated me for being arrogant enough to challenge an acknowledged superstar.
What was I to do to make this good salesperson better? I did the following. We had an important hospital system coming to our corporate office. I arranged for me to have the first 30 minutes of the presentation, and Joe could have the last hour. I used a presentation rich in graphics, footnoted references to clinical papers, sound, movement, and ideas that strategically addressed problems common to most hospitals. The audience was transfixed. I held them in the palm of my hand. I then turned it over to Joe. Within five minutes they were taking restroom breaks while he was still presenting. After the presentation the key customers came to me and asked, in front of Joe, for copies of my presentation. When I asked why the CIO said, “You’ve made my case for me. You have clear illustrations of benefits, footnoted studies…I can use this internally to sell members within our hospital system on your product.” WOW!
Joe was not a genius–he only thought he was–but he was smart enough to see how the customer had voted on our two presentation styles. Within a week he had adopted the behaviors I had wanted to impart, without me asking him to do so.