I buy all my glass pre-colored. I would do it myself but I do not have a kiln or the knowledge to do it. And there is alot of special tools that you can use to make some of those cuts. I try to use a glass cutter the most until I get to a point where i need a sharp inside angle and then i will use a glass grinder or a ring saw. There is alot of different steps you need to take to make stained glass. Like : Drawing Pattern, Copying Pattern, Cutting Cutter, Picking Glass, Gluing the pattern to the glass, cut the glass, grind the glass, wash it, foil it, burnish it, arrange it, flux, solder, add zinc border and hanging chain, solder again, flux remover, wash it, use steel wool on the the solder lines, add patina, wash it, and then wax and engrave. So ALOT goes in to making a stained glass.
Spider- I self taught myself.