How do you buy and fit a new/used groupset?
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?
Putting on your own gruppo
It's not the easiest thing that you can do. If you're not mechanically inclined, take it to a shop that you know and like.
Here are a few things you'll need to know how to adjust if your attempting it yourself:
-exact positioning of front derailleur, both z-direction and x-direction
-position of the b-screw
-positions of the limit screws (front and rear)
-chain length
-cable tensions, etc.
The process well described in a number of books, but these are the subtle adjustments that make the final difference of a "finely-tuned" drivetrain. And if you can get someone to show you how to do it the first time out, then it becomes a lot easier to keep it tuned from there on.
Hope that helps.