The bottom of the lights are fixed onto a Ball-Stud type arrangement. The light just pulls off of this with a bit of force (its meant to). Make sure the 2 fixings at the top of the light are loose, and then get your hands under the light towards the indicator, and then sharply pull / jerk the the headlight straight out of the front of the car. Once you've done it once, you'll understand and the other one will be a piece of cake.

Hope this makes sense.......