Lock the spine and the voice, set up readers and continuity, draft chapter by chapter, grade against a fixed floor, run the mechanical gate, then produce and ship it three ways.
The central act in these sixty steps is writing a book, about forty thousand words of it, and that is this part. Everything else in the book is arithmetic, machinery and measurement arranged around it.
Three steps from earlier in the book can be finished inside a month, from your own seat, with no book and no budget, before you start drafting: the buyer-to-customer arithmetic, the buying moment and avatar matrix, and the corpus of buyers' own words.
Nothing in this part is the first thing you should do. Three steps from earlier in the book, finished inside a month with no book and no budget, decide what the book has to say before you draft a word.
Grading happens in a fresh context against a fixed floor, on a capped revision loop, so the book doesn't drift while you edit it.
I built analytics models for banks and miners before this. Every step in The Book Is the Funnel is one we ran on our own funnel first, failures included. This part is sold on its own because most people need one piece of it, not all sixty at once.