ok, I decided to remove the chrome trim after buying some gloss black spray and sandpaper paint from supercheap for like $15 all up. I have an o7 i30.
I should have taken more pics along the way...but I decided to be lazy and I used paint to put red circles to show where the hidden 4 screws are. I will be pulling the trim off again since I was stupid...and decided to do all this 30min before i had to leave for work
First up remove the air intake (2 bolts) and then take off the obvious screws ontop of the grill, there are like 10 as everyone else has said. Pull out the ? gromets ? (not sure of the name) that the screws were sitting in as those are mostly what is holding the chrome piece attached to the bumper.
After this that should be all of the superficial screws/bolts off. Pull the grill forward a bit and if you look at this picture where I have circled (you might have to zoom in & if you want larger pics I can reup them or something) there are 4 more philips head screws there. Take the two on the sides off first using a stubby philips.
After this, in the black cuts in the bumper shown in the picture above, there are plastic lips which are holding it in there. Push them down and pull the grill outwards towards you and they will pop out. Do this for all the lips (possibly not the right word for it...but it'll do for now) on both sides of the chrome trim. At the centre, there are two more screws
Undo those two screws and this time, there are two lips. The top most one is a real @*^%& ti get out and you will feel like its breaking while pulling it out, but its just another lip that needs to pop out. After popping those two out, the grill should just slide out easily and thus job success!
Putting it back together was too frustrating doing it without taking the bumper off as the centre two screws are VERY difficult to get back in. Still no success so I have just installed it without those two screws for now (it still holds without any vibrations or anything). I will be pulling it off to do a final coat of paint and also to get those screws back in so I will possibly take more pics if you need and I will try do a better explanation.