It's a job...
You'll have to remove the door handle mechanism completely, which means removing the
door card (inside) then removing the 3 screws that hold it in place. (inside the door)
Afterward, remove the pawl assembly (on the backside) using a small punch. (held in by an expansion pin)
Then with a larger punch, remove the pin that holds the hey housing in place.
As memory serves, the "key" lock asssembly is held in place with an expansion clip. (like an "E" clip, but a thin wire)
Like I said, it's a job...
You might want to consider buying another complete set of door handles from Midwest Bayless.
It'll save lots of time and hassle.