If you are switching, then in theory you are OK other than possible injury. One of my issues was going to failure on every set, that seems to be too taxing for me these days but when I was younger I could do it without issue. I was also of course weaker back then though.
A lot of the Westside theories came from Dr. Zatiorsky, he has at least one book on strength out if you are interested in reading it. The Westside Barbell Club has plenty of stuff online,
http://www.elitefts.com has some articles and Q&A. I dont really follow thier stuff but they will talk about the conjugate method, and speed work if that interests you.