How do you install HID lights on a 2005 envoy?

To install HID lights on a 2005 GMC Envoy, first, disconnect the battery to ensure safety. Remove the headlight assembly by unscrewing the necessary bolts and gently pulling it out. Replace the halogen bulbs with the HID bulbs, ensuring you connect the ballast and wiring correctly, then reinstall the headlight assembly. Finally, reconnect the battery and test the lights to ensure proper functionality.