not the headlights.... the manual says unclip the plastic cover above the wheel. it seems to be held in place by flat plastic rivets - if I pull are they going to come out and (more importantly) pop back in once I'm done? i'm a bit wary of giving it a big tug and ripping something off that won't go back on.
If I remember correctly the plastic clips have a circular pin in the centre. Pry that centre not up with a flat screw driver. The clip will then lift free. To re-use just press the centre bit back into place to lock it.