Pretty easy. Just remove the trim panel, and peel back the vapor barrier. You'll have to hook the switch back up to roll the window down enough to expose the two 10mm bolts holding the glass to the regulator. Remove these and remove whatever is left of the glass. If the glass was broken, pull the rubber window run channel out and clean it VERY well. An airblower works good, but you can just turn the channel inside out and wipe the glass chunks out.. One chunk left in the channel, and you'll probably be buying another new glass when you roll it up.
Put the run channel back in, then from the outside of the door, put the front end of the glass in first, then with the glass in the run channel in front, rock the back down and into the run channel, lower the glass into the door till it lines up with the regulator and reinstall the two 10mm bolts. (these could also be large phillips screws, I can't remember exactly offhand)
