I just did this about 3 months ago. Very very easy, you will surprise yourself.
Remove the caliper and the rotor first.... I had to remove the emergency brake spring to get at the bolts... watch your face, that thing can do some damage and is wound very tight.
If there is enough stud left on the old one that you can give it a whack with a hammer, then have at it. IF there is enough stud that it won't get past the agitator, a dremel tool works great to shorten the stud you are removing... be careful not to gouge up anything else.
Once the old one is removed, line up the new one so that it is mostly into the hole. The back of the stud will be on the edge of the ABS Agitator. The best way, in my opinion, to get past it is to use a Big mo'fo C-Clamp. Tighten it SLOWLY, one end on the back of the new stud, the other beneath the hole where it is going (not above, as you might warp the plate. Eventually it will just pop into place.
Once it is in, use an open ended nut and about 1/4" worth of spacers (I used stainless washers that I had sitting around) to draw the stud into place. You should tighten it a bunch, then loosen it a little, tighten again, loosen. Do that a few times until you are certain you have it all the way in.
Then you can replace the rotor, replace the caliper, reattach the emergency brake, mount the tire and your off and running.
Cake and Pie, even for me.
