it's not that hard...
I've now built 3. The first took 8 hours (I pulled it apart because I couldn't see Hadley though the valve stem) and just general confusion regarding pushing and pulling directions and disc hubs, the next 5 hours, and a couple of days ago 3 hours for a King/Dt Swiss 4.2D. I'm slow and methodical which is good for this application but I'd get fired in a hurry as a wrench at a shop.
On the other hand, if your used to making a decent wage at your regular job then $50 doesn't seem too much for a hand-built wheel. Unless you bought the hubs, rims and spokes from the LBS at full retail then perhaps they should throw in the labor:skep:
I found Mike T's and Sheldon Brown's websites and info EXTREMELY helpul:thumbsup: