I have done this mod myslef on my Mazda 6s. It is pretty easy and you can do it like $20 depending on the paint and clear you decide to use. Here is the link to the DIY for the Mazda. I am sure that minus the obvious of it being 2 different cars, you can figure out what things are the same and what is not.
Black Headlight Housings How To - Mazda6 / Atenza