How do you install a headlamp on a Mercedes 190E?

To install a headlamp on a Mercedes 190E, first, disconnect the vehicle's battery to ensure safety. Remove the headlamp assembly by unscrewing the retaining screws and gently pulling the assembly forward. Replace the old bulb with a new one, ensuring it is securely fitted, then reassemble the headlamp by reversing the removal process. Finally, reconnect the battery and test the new headlamp to ensure it works properly.