Thanks.

How much of a pain in the bum is it to attach a CPU to the motherboard? Reason for asking, I can save ~£100 by getting everything separate but if I screw up inserting pins in motherboard/using thermal paste/screwing motherboard into case due to shaky hands, I'm going to get a little pissed off....

The safer option is to buy a hardware bundle, i.e. http://3xs.scan.co.uk/ShowSystem.asp?SystemID=1265