Installing New Headlight Bulbs

[robbd]

I was just trying to take my headlights out so i could change the bulbs in it to the silverstar ultra's, now i took out the 2 screws on the topside of the headlight box, and I sorta pulled to see if i could free it from the truck, but due to it being minus temperatures right now where I am I didnt want to pull to hard cause if there was some sort of plastic clip holding them in, well the plastic and cold temperatures dont mix so Ive decided to come back here and ask if thats all thats holding them in, or what else I need to remove to remove them. Thanks