It has 2 screws in the dome light; remove them and the trim piece can be easily removed .. or at least, it can be removed. It doesn't seem like anything is easy! This is one of those clip jobs; it has clips on both sides of the dome light. Once you remove the screws from the dome light, the trim can be popped off.

But you don't really need to take this piece of trim off the Chevrolet truck to replace the headliner in this vehicle. We never take the rear trim off, just slide the headliner out from under it and then slide it back under it when we are done.

We have a '90's model Chevrolet truck tutorial at this link: chevy truck installation.