Locate turbocharger, cold side- there will be intake hose, AFAIR there will be near it something with dimensions of ~one finger lenght and not-so 2 wide, connected with cable (two wires?) Unscrew it- do not lose screws (and do not throw anything in the hole, and don't leave dv valve hanging free- it'll catch dirt). Mount adapter, screw back tight with attached bolts (if there any). And it's all. You didn't need to unplug anything, but IF You would disconect battery- don't be afraid of check lights- ESP and steering will show up (ESP- after short ride will dissapear, steering- on engine on- turn wheel to the left and right limit- and it should dissapear after another on-off)
Edit:
http://youtu.be/-kKtbB7NDtQ
In video is showed where it's located. You're lucky- 1.4tsi have front-facing turbo with much space.