How do you replace the headlight bulb in a 2004 Yukon?

I can't give you the technical jargon, but let me give this a shot. First off, you don't need a screwdriver, so don't look for any screws. Open the hood and look straight down at the headlight assembly. On each side of the assembly, at the top, you will see what looks like the short end of a rather large Allen wrench. Turn both of these "L" shaped rods toward you, and then pull them straight up and out. They literally hold the headlight assembly in place. Pay attention to how they come out - they're a bit more difficult to put back than they are to get out. Once the rods are out the assembly can be popped out, and the bulb is easily replaced. Be sure not to touch the new bulb with your fingers. The oil from your hands can ruin it. At least that's what the guy from Auto Zone told me.

The key to replacing the assembly is aligning it properly so that the rods can slide easily back in place.