This is one of the most read books on the Camino that has truly had an impact. Pilgrims from all over the world frequently refer to it. Perhaps I'm just too academic or perhaps my psychic energy just hasn't yet matured, but I had difficulty stomaching the fantastical metaphysical accounts in this book. It came off to me as pure self aggrandizement, and I find it an unfortunate use of MacLaine's star power considering how many people have been influenced to embark on the Camino because of this book. You will be sorely disappointed if you are looking for practical advice. But, ok, it's her story and she can have it.
If you are looking for an inner look at the Camino with some practical advice, I would direct you to Nancey Frey's very nice book. If you are looking for a nice, concise, guidebook with great practical advice and maps I would direct you to the John Brierley series.
Or, read this website and blog.