I think there was a fitting guide at one point, but haven't come across it in a while.
Anyhow, the easiest way is to release the headlamp shell from the car (unless you have the hands of a gynaecologist!) and to do this, firstly take off the bonnet and lay it to one side.
Next, remove the two torx screws, one on top of the headlamp, the other nestled in between it and the radiator area (think it's T27 from memory) and then slide the shell forwards - it's not necessary to unplug the wiring.
Then, release the wire clip holding the back cover in place and you can then get into the bulbs, which are the same as every other car to change, apart from the sidelight, which sits in a black plastic holder. This pulls straight back out - don't bend it or it'll snap.
Assembly is the reverse of removal!
Cheers,
Mike