This is a wonderful book for the beginner or an intermediate practitioner of scrying in the spirit vision. Ambose Hawk makes something that is difficult for many people easy to understand and so his methods are practical and safe. While this book is not in conflict with Classical Golden Dawn methods of scrying, it is not a replica of Golden Dawn methods.
Get the book - it will broaden your view. My only suggestion is to learn a good set of Qabalistic banishings, such as the L.B.R.P. and the B.R.H. The book is published and can be found in the New Age section.