Making amber turn signal lenses

Hi
trying to do the same with my lenses but they dont seem to want to budge after the screws were removed. Tried gently prying with a screwdriver but knowing how that can end I figured there's got to be a trick to it. Any helpful hints? BTW car is a 1974 Duster, here is the grill pic for your reference.

Thanks in advance
Take bulb out and poke at lense with screw driver gently