When I did mine, it was quit tough. All I had to do though was, dissconnect the battery (of course). Take the belt off, by means of the tensioner pully ( this is a b****, due to the one inch of space to put a box end wrench and push ever so slightly so the wrench dosen't slip off and you bang your hand on something). Than just take the 3 bolts or how ever many you have, off. And pull the alternator out. This is way easier sounding than it is. The CV boot it right in the way, so their is a lot of adjusting and pulling and pushing and swearing involved. Unless you drop the front subframe like Paul says, than it's right out. And for some reason getting the bolts back in, with the rubber sleaves that go around the bolts, never seem to screw back in right. Like it wants to cross thread, but after a coulpe trys it will go in correctly.
I did mine myself cuse', the Ford dealer wanted $450+ tax for the alt and install. SO I just paid $80 or what ever it cost for the new alt. I would have bought a new gator back belt, but my belt was about a year old. It was put on when the SHO shop UDP was put on. All in all it a good project for a begginer.