If you like to get your hands dirty, I would recommend you get a set of basic tools like this
http://bikeisland.com/cgi-bin/BKTK_S...ils&ProdID=556, a bottle of simple green, and a tube of grease, and learn to do it yourself. I's really not hard, but you will still want to pay a few bucks to get your lbs to check your work the first time. It's a lot of fun and the tools will pay for themselves with the conversion and a year's maintenance.

If you don't have the time of the inclination, nothing wrong with that, just take it to the lbs, tell them what you want and have fun riding your new bike.