It's not that hard to do yourself if you are mech. inclined. You just have to take off the fan, ignition coil pack and a few other small things and then the cover comes off in 3 pcs. Just line up the marks on the pullys to the marks on the engine and throw it all back together. Along with the water pump as Sweater said, you might want to do the tensioner while you are in there too. It would suck to do all that work and a few month later start hearing the tensioner ticking and have to do it all over again.