I looked at that book too, but I've never had his problem of feeling blocked, procrastinating (not about my art anyway!) etc. Evidently a lot of people do, and the book is advice for them. But for me it dealt in detail with problems I've never had, in my many years of musician, composer, artist, programmer, so I didn't bother finishing it. I did however like the same author's Nobody Wants to Read Your Shit: Why That Is and What You Can Do About It

One major problem I did have years ago was a lot of negative self-talk. Being so mean to myself, in ways I never would have come close to treating other people. I dealt with that with a lot of self-help books, working on my issues from childhood, learning to love myself etc.