Removal and replacement if a simple, if a bit time consuming DIY project. Most of the work is done from above thru the open engine cover, but some find it easier to get at some of the hose clamps from below. Pretty much a preference thing. In any case, there a several online write ups as this is a common repair, so do a quick search.........
http://www.dietersmotorsports.com/tech/tech9-03-2003.htm