This book took me on an interesting journey - when I started it, I felt discouraged. The idea of just writing notebooks and notebooks of junk, seemed so useless. But "writing practice" is about training the mind to write, to record those "first thoughts" that are so raw and true and honest.
It is one of those books (like all books I guess) that you use your critical mind to extract what you will from it. By the end of it, I had a number of blue dots (this is what I do when there is an interesting passage that I want to return to at a later date) beside various paragraphs towards the end of the book.
Here is one 'blue dot":
'If you begin too exactly, you will stay precise but never hit the exact mark that makes the words vibrate with the truth that goes through the present, past, and future." p. 165
In other words, let go, be free to write as you want to write, with no constraints. Wander, test and try. You can always return to accuracy.