If it's like the front ones, then a press is essential. I know this, having just watched my mechanic replace one of the fronts after just over a year! To say I wasn't happy is an understatement, especially as they wouldn't do it under warranty as that was 12 months! A "German bearing" was apparently used last time - although not an Audi one at £100 or so. I go the replacement for cost, but still had a £120 bill - 1.5 hours labour overall - and it was, because I watched it. I'd certainly not try without the press. Mike.