Are they shorty headers, or are they the full length style?
If they are the later it is a lot of work. If it is the shorty headers, they are pretty easy to install, the hardest part is removing the studs from the head, and tightening the new exhaust bolt into the head. Header bolds have a tendency to back out a lot and there is not a lot of room between the bolt head and the header pipe. One other little thing, don't bother using the gaskets that came with the headers, invest in a set of copper gaskets, they last longer and seem to help with the probem of exhaust bolts backing out.