If you want alcohol poisoning, take a shot every time you read "spark" or "grind" in this book.
The author is of course, very impressive. He's made a living as an entrepreneur, making quick, high quality paintings in a way that is more showmanship than craft. But he has optimized to a very fine degree exactly what makes a performance tick, what draws and hooks an audience. He is a magician at heart, captivating imaginations and inspiring crowds to imagine something else than what they've decided can be theirs.
But, this book? Very boring. Not helpful. Nothing new that you haven't read before, but mostly a story of how a man turned his life around. For every success story there are thousands of people who didn't strike gold, and here is a book about how to mine gold.
You know those YouTube videos of creative thinkers who get up at 4am every day, meditate, work out, and take intense showers? This book has that essence, distilled. It's very showy, but lacks meat. It's a lifestyle advertisement. There are attempts to be more self aware - the book mentions that it can be the right decision to keep your main job while looking for the side hustle. It vaguely mentions intermarital stress. Everything else? Confetti and glitter.
The book has one eye-rolling example after another of famous creators and artists who sparked their grinds and ground their sparks into success. Maybe some readers would find this inspiring. To have a success story of that magnitude, you would probably need that mindset that you can beat the odds. I find it to be posturing.
You can read the first chapter of this book, and understand the remaining of the book from that excerpt. It's the same thing, over and over again. Wahl really did just take one of his painting talks and stretch it out into a book.
This book is vague, full of feel-good without anything really substantial, literary junk food. It was a pain to read, but read it I did to see if I could learn something. You'd get the same vibe from any interview by a celebrity on how they battle through mental blocks or tough times or how they got their first gig. Do yourself a favor and watch Erik paint. It will be much more inspiring and a better use of your time than this book.