No. That ones no good. you need 2008 or before pre facelift, and no you don't need to change bonnet. Also you should be able to find one a little cheaper than that. Yep just undo the torx in the front wheel arches then all the torx screws along the bottom of bumper, then iirc it's 4 across the top of the grill and 2 10mm nuts each side, kind of hidden behind the headlamps that you get to by pulling the arch liners to the side and going in there with a socket and an extention bar. you should find plenty of tutorials on youtube on removing bumper. it's not a long or hard job, maybe a bit fiddly the first time.
Ask on here if anybody has one in the classifieds ads under wanted.