This may not be the "proper" way but it has worked on both my passenger side and now the driver side. And I can do them in about 15 mins.
I guess the motors in them just get weak and won't lock or unlock the door. When I opened the old ones up no gears were broke and it all looked good.
Step 1: Gather Tools
Looooooong straight blade screwdriver
Small straight blade screwdriver
Oh, and the replacement actuator.
Make sure to roll the window to the UP position too.
Step 2: Removal of door panel, Screw #1
You can see the clip and tab in the next photo.
Once you get the bezel out remove the phillips screw
Step 3: Removal of door panel, Screw #2
Once removed, remove the phillips screw shown.
Step 4: Removal of door panel, Switch Panel
This may be a good time to tell you to disconnect the battery since you are working on electronics.
Step 5: Remove door panel
That is all, just lift up. No prying, pulling snapping etc ... just lift straight up and pull out and it will come off.
Step 6: Getting to the actuator
Remove the bolt shown to let the window guide rail move to get more room around the actuator.
There it is. Use the long screwdriver to release the power connector without breaking the tab off.