I should have taken some pics when I had it apart dopey. But I'll try and explain as best I can.
- remove the one screw shown in the handbook.
- you would now expect that the surround would come away from this side, but it doesn't. DON'T try and prise it out from this side as it has lugs that slide into a recess horizontally across the bumper.
- you have to try and pull out from the other end. It has vertical lugs (i.e. lugs that push into the bumper rather than across it like the other end) that hold it in place. You can carefully pop the surround off around the edges in the middle to help with this.
- once you have it away from this end, you have to then slide the surround towards the centre of the car to free the lugs from the other end.
It does need a bit of effort to get the centre end out, but once you have, the screw end will just slide out.
Replacing it needs extra care. Obviously it's the reverse procedure. Locate the screw end with the lugs into the bumper, but only just - because you need to make sure that you have the lugs on the other end moving into the right position too. If you don't, you end up bending those lugs over and wondering why the surround won't seat properly (it's because you've bent them over). If you do this you can straighten them, but you risk snapping them off.
It's a little hard to explain, but the surround needs to pushed into the locating slots in the bumper, while at the same it has to be slid sidways to locate in those slots. You'll see what I mean when you do it. It's not a huge deal, just a bit of patience is needed -it's a crazy design, an extra screw at the other end would have been a whole lot simpler!
UPDATE: this is just to remove the surround - once this is off, you just remove the two screws that hold the actually light assembly in place.
Hard to photograph, but the result is worth it IMO:
http://www.members.westnet.com.au/jsturn/pstfront.jpg