This write up is for an '01 Silverado, so similar models, should be close if not the exact same.
First of all there are only 2 - 9/32 bolts that hold the door panel on. One is located right behind the door handle in plain sight. The second is located under the switch panel. It's a snap to remove; just pry around on it and it comes right up. Once again; these are the ONLY 2 bolts holding the panel to the door.
Snap the cover off that goes around the door opening handle and also the little triangular piece that's where the wing windows used to be on the older trucks. Also pull the plastic part that's over the door lock. Then gently lift straight up just a little and pull out towards you. The panel will come right out where you can then unplug the speaker wire and remove the bulb assembly from the door light at the bottom. 1 - 3/8 bolt holds the door handle on; remove the handle and set aside. Then strip the plastic off being careful not to tear it since this will be reused. This is to keep moisture out and road noise down.
A common problem is a broken cable so you could move my window up and down by hand, but you may have to plug the switch in to move yours to the right position. it's about 1/4 inch down where you can see the 2 - 3/8 bolts that hold the window to the regulator. Loosen these bolts then gently break the window free. Pull it all the way up and tape it there so it doesn't fall and break while you are removing the old unit and installing the new one.
There are 6 - 3/8 bolts that hold the assembly in place and it's pretty easy to figure out which ones they are. Take these out and work the unit out through the large hole at the bottom. The new one goes in pretty much the same way only in reverse. After you get the 6 - 3/8 bolts back in place plug the window switch in and roll the unit all the way up being careful to make sure the clamps are going to line up with the window. when they do, take the tape off and slowly lower the window where you can tighten the 2 clamps down on the glass. Put the plastic back on, then the door handle.
Plug the speaker wire back in and put the light back in at the bottom of the door, then set the panel back in the holes. shouldn't be hard at all.
Reinstall the 2 - 9/32 bolts then plug the switch assembly in and snap back in place. Replace the rest of the plastic covers and you should be pretty much finished.
This is also a good visual reference to help as well.