having done this myself, id reccommend taking it to a mechanic
lolz unless your good with your hand and tools,,
to do this you have to drain oil and coolant. remove the water pump, oil pump, clutch and oil pump drive shaft.
its a fairly big process for such a small job, i had to do it though as it wouldnt pass scruitineering for racing with it leaking oil like that.
all up it should take a compotent mechanic about 2-3hrs. so at $70 p/h (i think thats the rate) $210 for labour, then you add on consumables, oil, coolant, and gaskets. youd be looking at a $400 bill id say.
cheers