This is powerful book and not to be taken lightly, the exercises written are dangerous and should not be practiced without a proper timeline/patience or otherwise with a mentor, speaking of the initiation which is the last section of the book, it will be very foolish for anyone to go through such an initiation without a mentor of some sort even if that mentor is an astral mentor, the rest of the book however could be practiced throughout at least a year and the energy workings are very powerful and cannot be found anywhere else.
Clearly the path itself laid out in the book has some kind of protection so that no one would start unless really called, I personally don't encourage any dabbler or similar to practice the serious rituals laid out in the book but the basic invoking and the energy workings can be done as I said at least a year to see if you are called. Actually it is a surprise to see such a book I think it's rare. The writing style is simple and empty of useless fancy words and straight to the point, however I wished that Bear heart wrote more personal accounts on his trials of initiation to give more idea to the uninitiated about how dangerous this path is, overall good book even if for the energy workings themselves worth it.
(reviewed the day of purchase)