I just replaced a busted rear tail light with a new one. All you do is open the trunk and undo the latches on the tail light to be replaced. Push the layer with the lights back so that you can get to the outside part that need to be removed.Unscrew the old tail light and replace it with the new. Screw the light bulb layer and the plastic outside cover layer back together. Put cover back on and turn the latches shut. I am not a mechanic at all and I did it myself! A friend of mine who owns a mercedes car place told me how to do it.