I watched a mate of mine who was a mechanic change over mine, I went with H&R, if I remember correctly the front ones were the easiest, he did not have to remove the front shocks, the rear were awkward as he had to remove the shocks as the springs set around them. It took about 2.5 hours from start to finish as he had to adjust camber etc once the job was complete. I might have said this to you in a previous post but I fitted the H&R with the non sport Audi suspension and it was crap, the ride was to bouncy and loads of body roll when cornering' so take my advice if you do not already have the sport suspension wait and change both shocks and spring together it will save you time and money and your car we handle like a dream.