Done it a while ago but dont think its any different to the fronts. Need allen keys for the carrier bolts iirc but other than that yes its the same as fronts, other than the rewind tool.
As for pad prices I upgraded to tarox discs and pads all round so werent cheap but improved braking no end, havent had one issue of brake fade at all.
If going for standard pads and discs send PJMSPEEDY a pm on here, he's the man to see for oem parts.
2001 Audi S3 - AMK 210bhp
Tarox F2000 discs front - Tarox 401 Rallye+ pads
Tarox F2000 discs rear - Tarox 112 Strada pads
Goodridge brake lines
TT pedals
N249 bypass
Finally back on the road, have a HUGE list of mods and things to do now!