Hi,
Wiswind has some great pics that he has taken of his car and repairs that he has done. The pics can be seen at this website:
http://community.webshots.com/album/201931518cScpNK . On page 5 he has pictures showing step by step how to remove door trim. Also if you do a search on the Windstar forum for window motor you will find a lot of great information on how to replace the motor.
Hope this helps!