tail light 1995 F150

I am trying to change the directional bulb in my tail light. There are only 2 screws on the outside which do not seem to do much but loosen the lens. When I drop the tailgate there are 2 more screws on the inside but they are frozen tight. ( even liquid wrench doesn't seem to help) I am not even sure if I need to remove them to get the lens off? I do not want to break the lens trying to do this. I read a message from last year for removing the lens on a 97 F150. They said there are some clips holding it in when you remove the 2 outer screws so you have to pry the lens off. I am not sure if the 95's are the same? I have the old box nose and they changed the body style right after that. Any help is appreciated. Thanks