How do you remove the dome light? I know, silly question. I need to take it out so I can remove the headliner to recover it. Thanks.

There are two small round washer type pieces that slide over the little pins which are screwed into the roof, sometimes needlenose pliers or wire cutters are useful for grabbing them, but often you tear them up, probably cheap to replace from GM. The other way I have found that works good is to use a cordless drill, run the chuck down on each pin and tighten it up good, then run the drill in reverse, removing the pin with the little washer-clip with it.