That advice by the way, is some of the best ever put in an RPG book.
We all probably skip the 'how to be a GM' chapter, but this is one book were you should read that stuff line by line, maybe even print out a page of your PDF and bring a highlighter.
Because the 'narrative format' is an actual thing baked into the rules and not just a 'coffee in a cafe with a goatee and beret on, so we're so cool' notation like it usually is... they actually had to break that down and explain how to do it.
Nobody's going to pretend to be 'cooler than you' with fancy claims, they actually try to teach "regular gamers" how to do this stuff, with detailed advice, mechanics, and examples.
So read the 'how to play' stuff, and walk yourself through the examples. It's different, but it's also very approachable once you read that stuff.