No smith needed really. They are about as simple a drop in as you can get. Lots of video instructions on Youtube, some of which are pretty detailed yet still easy enough to follow. Here's a fairly detailed one:


As far as where to get one, Midway probably has the best price. This one would probably be your ideal model since I am assuming this is going on just a standard hunting rifle and not a long range setup or bench gun. http://www.midwayusa.com/product/114...-1-1-2-to-4-lb