You should be able to see a screw when you look down at the headlights with the hood open. There is a hole in the metal running along each fender. Just unscrew that screw a little and the corner will pretty much fall out. There is only one screw.
You will have to use a phillips screwdriver that is about 5 inches long
<img src='http://img.photobucket.com/albums/v296/MaThGr82/BMW%20325Ci/5d2c4361.jpg' border='0' alt='user posted image' />