Yes, you need to remove the door panel. First, unscrew both the handles and the armrest. Use a putty knife or something else that's flat to pop the bottom three sides of the panel off. Then
bump it with the heel of your hand at the bottom so it will slide upward, out of the window channel. You can unscrew the two mounting screws for the handle assembly when the window is up.
Next, check out Zenon Holtz' site. Lots of good stuff at
www.zeebuck.com, but here's the link to his page on unsticking and re-keying the door locks:
http://www.zeebuck.com/bimmers/tech/doorlocks/doorlocks.html
Good luck!
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ClayW
1976 Fjord 2002 Sunroof
Project Blog
"Finish the thing, do it right the first time and drive the son of a bitch!"
-Gray Baskerville on hot rod advice