look at the light... you'll see the bracket behind it... take the 4 screws out that are securing the bracket to the bumper... and unplug the light... on the backside of the light, there is a series of screws around the perimeter of the light... take them out and remove the back of the light... inside you'll see a metal clip holding the H3 bulb in place... remove the bulb, unplug it and pop the new one in being very careful to NOT touch the glass. then reverse the process...

its actually really easy.