Replacing headlamp on '96 Mercury Mystique?

I need a bit of help to replace the entire headlamp, not simply the bulb on my car please. I'm not 100% sure how to do it, although I have some general idea. It doesn't look as though any screwdrivers are necessary, at least from the headlamp cover that I'm looking at. I just don't want to pay $50.00-$80.00 for labor when the part cost only $30.00. Thanks in advance ^_^