But like with anything else... it wont work if you just read it alone. I have tons of trainings and books that I just read and never actually applied anything from it.
So if you will dedicate yourself to reading it from front to back and really REALLY doing what it says, then I think it will be worth it.
But if you have low confidence or a very negative self-image, then you will likely want to start with something on that first because some of the words require you to be a bit bold and creative. My opinion