I think you answered you own question. You use a saw, jewelers, then a drill, hand or electric but the chuck on an electric may be to big for the size of bit you need, files and sand papers will take care of your needs for smoothing off the cut corners on the wire. I don't know what size of community you live in but if there is not a jewelers supply store in your area there is always the web to shop on. There are also some very fine tutorials here a AJ on basic jeweler techniques to consider. Large gage silver wire can be purchased on line. Otto Frei has a nice selection of tools and I believe that they also sell the metal too.