This is a bit of a stupid question and I'm going to ask it even though I'm actually happy with my bike at the moment. But how do people get a new groupset on their bike? If I was buying from the LBS it would be easy as I'd just get them to put it on. But if you pick up a used (or even new) set from ebay or elsewhere would it be really poor form to take it into the LBS and ask them to set the bike up? Do they normally charge heaps to do it? Is it possible to read up enough and do it yourself?