LEGO set restore-er? (Emerald Night)
This is fairly easy to do yourself. You can get a listing of all the parts that you should have for the set via a reference site such as Bricklink. Here's the Bricklink inventory for that set:

http://www.bricklink.com/catalogItemInv.asp?S=10194-1

You can then purchase any missing pieces. The best place to do this is probably on Bricklink as well.

You can then rebuild this set from the instructions. If you've lost the instructions, they are available directly on LEGO.com as a PDF. Brickset also provides easy access to these files. Here are the two instruction booklets on LEGO.com:


Part 1
Part 2