Necessary preliminary tasks

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Open door window.
Remove rear DOOR TRIM PANEL

Version with roller sun blind:

Remove ROLLER SUN BLIND ON FIXED SIDE WINDOW

Version with roller sun blind:

Pull off hooks (2) in outwards direction.

Detach cover (1) sideways from clips (3) and unclip in inwards direction or lever out and remove.

Fig 1: Pulling Hooks In Outwards Direction

Courtesy of BMW OF NORTH AMERICA, INC.