I'm trying to get the evaporator cover off of this top mount freezer to get the drain de-iced. I have the ice maker off already and the 4 screws off the cover. I still can't get it off. Am I missing something, or is it so iced up that I need to hit it with a heat gun to get it off? Also, on a scale of 1-10 on the pain in the butt meter, how hard is it to change out the divider on this beast?