I have read quite a bit about the Golden Dawn, trying to get "inside" the minds of AE Waite, Pamela Coleman-Smith, Mathers (Mina and her husband), et al.
This book is for those who have studied under previous books of the GD in higher ranks...The lingo is too varient for an outsider to understand, the instructions and definitions (clairifications) are confusing at best. Chic Cicero and his wife, have a more simplified way of putting the rituals, the uses of Tarot, as well as the Kaballah.
If you are looking to understand the Golden Dawn philsophy and rituals, your best bet might be to look at their books and Mary K Greer's.
He spent a great deal of time, explaining how his group was the last of the GD's in the world...ok..and...?
I like to read intellectual books, but I prefer to read ones that don't pontificate their understanding in a way that makes the reader feel stupid. There are better books out there, I promise.