I got my kit from VW teeside for about £70 and that included everything I needed and it came with a
guide however I also used the guides below. (I can't post URLS yet so add the www)
uk-mkivs.net/forums/t/221940.aspx
carbasics.co.uk/vw_golf_mk4_cruise_control.htm
I fitted it myself yesterday and it was ok to be honest, but I have had to remove steering wheel and wipers before due to previous wiper problems. Loom was reasonably ok to install when following the guides. I also bought VAGCOM so activated the ECU myself.
I can give more details anyone needs any
help.