well my one is a fake one thats Carbon Fibre, but id say its a sililar job. you will ideally need an extra pair of hands....
place the lip on the front of the car central, the two sides will stick way out but dont worry...
get someone to hold the front of it in the position your happy with
they are quite flexible so dont worry, bring each corner over and using self tappers or supplied hard ware screw the lip to the inside of the bumper along the wheel arch...