TLDR: Badly done. Don't waste your time or your money. Buy a book by Matt Bird, Janice Hardy, K. W. Wieland, James Scott Bell, or pretty much anyone else.
I was going to give this book 3 stars, but then I got further into it, and I just couldn't.
There's some good information in this book, but so often I just wanted the author to get to the point. He fluffed the word count out with completely useless stories, side tangents, poetry, word origins, crystal use, and stuff about witchcraft. Why? None of that helps me become a better writer. This was incredibly annoying and frustrating and makes this a book I can't recommend. It felt like he was wasting my time.
And the grammatical errors... The author says that writers should do their best to have a clean book, but he also says that no one cares (and those that do are too stuffy) and you can basically put commas wherever you want. And he did. He threw a lot of the rules/guidelines about punctuation and grammar out the window, and it was not a pleasant reading experience.
Still, had that been the extent of the problems, I think I might have still given it 3 stars. Or at least 2 stars. But then I got to the last appendix. He says, "Don't assume your sober writing is your best writing." He advocates, in detail, for writers using substances. And not just alcohol. He says you'll be more creative through substance use. What? I'm sorry. This isn't healthy or wise. Does he not realize how dangerous this advice is and how many writers in the past destroyed their lives (or killed themselves) because of their substance use/abuse? At the risk of sounding like my grandma, shame on him. So many successful authors are fighting this harmful stereotype about the writing life and advocating for healthy writing habits and are calling attention to how harmful substance use has historically been for writers that for Murphy to advocate for it instead and try to undo all that good work is irresponsible.
I'm going to delete this book from my Kindle now and hopefully never think about it again.