It's a Holden VE Commodore, but this video should get you there. https://www.youtube.com/watch?v=eUrVpuo8BUQ
btw, if you want to seperate the 4 hex nut fasteners, w/o pulling them out of the plastic, just shake that location vigorously, and they might slide out of the metal slots instead. No one wants those hex sides spinning freely inside the plastic bumper cover.