Just changed mine last weekend. Actually, it was my second try at it since I chickened out the first time and just re-tightened the screw that holds the assembly in. After you have unscrewed the retaining screw, you will notice the lense assembly is somewhat loose, but by no means did mine want to pop out. I carefully, but with some force, pried the lense assembly out using a rag and flat head screw driver. The lense assembly finally gave way and came out. Appears there was a lot of friction due to the gasket seals surrounding the lense assembly. If you run into the same thing, just use some confidence to pry that baby loose.
Of course, I have a '95 and it might be the first time the bulb was changed. You might not experience the friction fit that had to deal with. Stick with it. I found the bulb at local department store for about $1.00.