I am not familiar with your car, so I cannot help you with removal of the lens, however, I can reccommend and suggest the following if this seems weird or ridiculous.... then don't do it!
Once you get it off...
1. Clean the insides of lenses and reflectors of housing, DO NOT TOUCH THE BULBS! (The lifespan can be shortened a lot!)
2. Use Rain-X and apply a coat on the inside on the glass lens. Helps to prevent possible problems....
3. When reattaching lense, use silicone sealant (hardware store, outddoor window treatment stuff..) and cover all seams between the glass and assembly.....