My friend and I drove over to Pit Start last night, which is a self-service garage with plenty of space, tools, jacks & lifts to use... it's Ł10 per hour to rent a bay (Ł20 per hour with a lift) and we managed to do the whole job in 2hrs 40mins.
I decided since we had a few trolley jacks to hand, it'd be easier to take the front wheels off to gain access to the bolts behind the wheel arch liner. So off they came & after a bit of persuasion, the bumper followed suit & was off the car.
I had already taken off the matt silver surround from the RS4 grill as it had light damage (got it via the classifieds on here) and I wanted the chrome surround to match the theme of my car. As I wasn't going to use this part, I didn't really mind snapping the tabs holding it on, but when it came to removing the chrome surround from my S-Line grill, I tried not to break them all, which took a fair bit of careful prising and two of us making sure the ones I'd released didn't just snap back into their locating positions. Needless to say one or two stubborn ones lost the fight with the screwdriver.
Then I offered up the surround to the RS4 mesh section & clipped it into place.
Finally, the bumper went back on, followed by the wheels, and the trolley jacks removed. I can't actually get a trolley jack under my car so I have to use the car's own jack to raise it enough to get the trolley jack under it, then when lowering it down, I have to extend the small jack up to meet the chassis & gently lower it on to this before then lowering the car down on that once the trolley jack is out from under the car... bit of a long winded process!
Anyway, here's the grill before it went on - you can just see the slight dent on the surround (by the radio):
...and here's a crap iPhone pic of the results: