How do you replace headlight assembly on a 1986 Volvo 240 DL?

To replace the headlight assembly on a 1986 Volvo 240 DL, first, disconnect the battery to ensure safety. Remove the retaining screws or clips holding the headlight assembly in place, typically located at the top and side of the assembly. Carefully pull the assembly out, disconnect the wiring harness, and replace it with the new unit, reconnecting the harness. Finally, secure the new assembly with screws or clips and reconnect the battery.