I did mine and my Mums just recently.
It's definitely fiddly - especially when fitting all the cable and that ruddy relay back in.
But having more patience and smaller hands than me Dad helps.
Halfway through my Dad said, "You can always put it back the way it was you know...". 
jimbo

Superchips 130bhp - Audi 1.9TDI badge - 18" RS6 - R32 Brakes - S3 caliper springs - S3 Lower strut - R-Line bodykit - 30mm drop - Comfort turn signals - VW MFD sat nav - TT arch liner vent - Cruise Control - R line bra - US indicators - Xenons being built - S3 dual intercoolers being built