Removing the seat belt from the rack (see Replacing the front seat belt).
Using a Phillips screwdriver, unscrew the two screws securing the lower upholstery of the rack...
... and, lifting it, remove it.
Remove the door seals from the rack. Using a slotted screwdriver, pry off and remove the interior lighting cover (see Replacing the interior lamp).
Remove the upholstery of the rack by moving upwards.
Install the new upholstery in the reverse order of removal.