You should immediately start applying what you learn. Even before you finish the book. Type out and modify any example code, write little practice programs, etc. Passively reading is no way to learn technical material. Also, take notes (in your own words) and periodically review and condense those notes.
Procrastination is usually caused by anxiety and the way we speak to ourselves, and this book is all about addressing that. You can have all sorts of rules and systems, but if you don't treat yourself with positivity and respect none of those will matter. My biggest takeaways are that you should not let work bleed into your leisure time, and you shouldn't base your self worth on your work.