The grill is not difficult to do yourself. There's loads of posts on here showing step by step how to do it.
I can't imagine painting the calipers would require a garage?? Unless there's something I don't know?
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2012 A5 2.0TDI (B8.5) Special Edition Technik, Facelift model, Phantom Black, heated seats, MMI 3G, Full leather interior, Manual Gearbox. MODS: JOM BlueLine Coilovers, Samsung white LED headlights, K&N air filter, 19" Grey Rotor alloy wheels, 15mm-20mm spacers, LED taillights, 3D resin number plate, painted red calipers, RS5 Grill, Custom Exhast, APR stage 1 remap. (All bought and waiting to be put on the car when back in the country. May do a build thread)