Wahoo40 - If you are just trying to remove the door handle you won't need the ferrule tool. There is a screw on the inside of the door that goes into the end of the door handle stem. Take that screw out and the handle should slide right out. There is nothing else holding it on. You shouldn't even have to take the interior door pannel off.

If it doesn't slide out you'll need to get some PB-Blaster or Liquid Wrench in there to loosen up the rust.

Good Luck
George