I think you have to be able to be Pshyco to understand his first book , not well written, one's came after a bit better but not much, learning other people's concepts are difficult when one does not have clear understanding of the gentleman offering his mind to the reader. But the more you reread it, the fuzzy parts become clearer. I seldom check youtubes, rehashing of other's and I have lost the motivation that others have developed anything better.