Unless you are a mechanic...I wouldint attempt doing it yourself. I put a set of 355 in my 87 LX. Didin't know the first thing about Backlash.....let me tell ya...I know all about in now!
Dealer install will be the more than most local shops. I didn't have the time and had the work done while I was in Hawaii, it was $779 at local dealer for me.