HI Max
Just wanted to add my two cents since i've done this job about three times in the last two years. First of all you don't have to take the whole dash apart if all your trying to change is the motor. If you want to do the heater core as well then have fun, its like playing with legos, take pictures and label everything. Now if the heater core was working well before, then i wouldn't worry about it. If your just doing the motor the links they gave you are very helpful, the only bad thing is that because of the way the resistor is built and the placement of it, you would have to open up the whole heater/core box to slip a new one down in there, you'll know what i mean when you get in it. One of the times i did this job i needed a new resistor, (probably a good idea since the new motor comes with it), so instead of pulling the whole housing out i kinda pulled the wires down a little and soldered the new resistor to the old wires, this ended up being a true PITA, i think maybe clipping and splicing would've been easier. Anyway just some things to think about, either way if you've never done this before i would schedule at least two days of work. Let us know how it goes.
cp