To remove the outside/exterior door handles, you should follow the these steps as found in the workshop manual:

Step 1 - Remove escutcheon locking screw (see fig 6) from the edge of the door.

Step 2 - Remove screw (see fig 6 and fig 2) from handle shank.

Note: On early models, the handle was retained by a screw and retaining washer; on later models the washer was changed and the shank was split with a saw cut, a self tapping 2 BA screw being inserted, thus binding the shank in the lock bush.