Originally Posted by rooroo

To remove the headlight, disconnect all the lights from the assembly. There are four hex screws that hold the headlight in place. Two on top the headlight, and the other two are located behind and down. (don't let the back screws fall or you might never get them again) The whole assembly pulls out towards the front of the car. To replace just reverse. There is a plastic piece under the headlight that will need to be removed and put back when replacing the assembly. This piece is a little bit of a pain, but not to hard to figure out.

Are the lights plug and play?
Does they require any special type of ballast?
Will they trigger any fail codes on the OBC?
These are the things that can make it more complicated.

MrBMWX5 is the member that I think has done some great mods on headlights. If you come up with any issues, maybe reading a few of his threads could help you out with the wiring process.

Good luck