2006 Chrysler Pacifica Changing headlight bulbs

I am trying to improve the brightness of the front headlights by changing from std. bulbs to silverstar bulbs. To do this I have to remove the front lenses. following the instructions I should be able to remove two screws from the top of each lens and pull out the lens to get at the bulbs. I did tnis but experenced significant resistance like there is another clip to release. I do not want to break the lenses. Do you have some advice on how to get these lenses out? I live in NH where it is pretty cold now.

Thanks