If you have one of the later models, it's rather easy. Take a philleps screw driver and loosen the turn signal screw (you don't have to take it all the way out). Remove the turn signal. Next remove the rubber gasket on top of the headlight lens. It snaps in place. Be very careful with the snap closest to the grill. It can break easily. Next, remove the plastic "under brow". It snaps in place as well.
Then unsnap the headlight cover. You are home free.
Follow the reverse to put them back together. Be careful not to touch the headlight bulb while you are in there. Use a flat head screw driver to help unsnap the plastic.