How do you change a door lock on a 1966 thunderbird?

To change a door lock on a 1966 Thunderbird, start by removing the door panel to access the lock mechanism. Unscrew the retaining screws and disconnect the linkage from the lock cylinder. Next, remove the old lock cylinder and replace it with the new one, ensuring it's properly aligned. Reattach the linkage, secure the screws, and replace the door panel to complete the installation.