How do I remove the side mirror on a 2008 ford f250

SOURCE: How do remove drivers side door panel

First you need to remove the door handle and window crank by pushing back the ring and releasing the handles. Also the arm rest will have screws into the steel door frame that must be removed. The panel itself has plastic snaps that are pushed into holes in the doors steel frame. The trick is to slide a pry bar or even two is better, one on ether side of the clip and force the pin out. You need to be patent and do one at a time. The door panels are made of a less than hard strong material and will brake apart easily especially if they are older. The clips go all the way around the lower three sides and the top will lift off the sill.

SOURCE: Remove the Passenger side door frame on a 2002 Ford Explorer

    Lift up on the switch plate until it snaps out ,remove the bolt from under there and the bolts along the bottom of the panel. There may be a few others so look around. When all are removed lift up on the door panel(DO NOT pull towards you it will destroy the panel). Your mirror is now accessible.

SOURCE: 2008 Ford Fusion Wing Mirror Replacement

I checked Ford Focus mirror replacement and it seems to be the same. This is for the manual, unheated mirror.

Remove the mirror cover inside the door - slide a screwdriver behind the cover and pry loose carefully.

Remove the single 10mm bolt and the mirror comes free.
NB. Do not drop the bolt into the door.

SOURCE: removing radio from 2008 f250

First you will have to remove the bezel around the radio. This bezel will also be from top to bottom. The bezel is snapped into the vehicle. Pry it out very carfully. Clips will be located at the top, middle, and bottom of bezel. Once snapped out, unplug harnesses so that you can easily work with radio and will help with not scrathing bezel. Once the bezel is out of the way, there will be four screws, 7mm or 9/32 use either socket size, that will be holding radio in place. Remove screws and then pull out radio. Use an aftermarket wire harness to make your installation easier. Install bracket and radio using screws removed and resnap bezel in place.

SOURCE: Replace Passenger Side Mirror on 2002 Ford F-150

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can access the bolts that secure the mirror onto the door