How do you replace a 2001 Ford Focus window regulator?

To replace a 2001 Ford Focus window regulator, first, remove the door panel by unscrewing and unclipping it to access the regulator. Disconnect the window from the regulator, then unbolt the old regulator from the door. Install the new regulator in reverse order, reconnect the window, and reassemble the door panel. Finally, test the window operation before securing everything in place.