I installed the Mole Skin today and took a few pics to compliment some of the instructions given by other members. Here you go:
To loosen the door panel remove the screw on the door handle.
Then loosen the screw on the side of the panel.
Next remove the corner panel, this just pops right out.
Now you can pull the top of the panel towards you to access the plastic window track. Then just pull it off like so
Once you have the track off, apply the moleskin or felt.
Here is the moleskin attached to the plastic track.
As per the moleskin directions I used some steel wool to coarsen the plastic track. I then used some rubbing alcohol to clean the surface and simply applied the moleskin. It was all fairly simple except for getting the door panel back on. It took some muscle to get the edge of the panel back in place but other than that it was a straight forward install.