Well, first of all, they tell you to remove your floor mat on the driver's side and put it in your trunk, then below you see the photo of the little square metal shim they install and it takes about ten minutes.
(http://www.vtgrandpa.com/photos/albums/forum_photos/toyota_fix_100206.jpg)
If you want to read more or see a video, click on the link below:
http://www.wcax.com/global/story.asp?s=11945664 (http://www.wcax.com/global/story.asp?s=11945664)