As already said, keep track of all hardware and take you’re time. It is a relatively easy job and you will gain insight on how these things work. Use painters tape to hold the window up until you have the new regulator in. I just replaced the passenger front and it wasn’t to bad. The door panel only has 2 screws, and slides up to take off, the lock pops out, back first, there should be a screw in the armrest near the center towards the bottom and at the bottom of the door panel towards the front. Have funI just bought a 2003 avalanche and the rear window will not go up. I believe its regulator arm is bowing and I have to change it. Does anyone have any tips that will make it easier?