bamboo: No worries, buddy. The thing with the theory of Changes is that it's pretty much built into every aspect of native Chinese thought and life. Reading it would certainly benefit one's understanding of the art, but it's not necessary. The concepts are built into the martial arts influenced by them and, in fact, many excellent Chinese martial artists throughout history were illiterate. Of course, the ones with a scholarly bent all studied the Changes extensively and wrote their own treatises on it as it related to their arts - one of the best examples in this regard is Chen Xin's work on Chen-style Taijiquan, in which he derives the rationale of the art from first principles. I have the book in the original text sitting on my table right now and it's HEAVY going
The works of Sun Lutang, who influenced all of the Big Three internal arts, are another good example of a scholarly take on Chinese martial arts.