I use a pistol grip cutter which is oil-filled and readily available on any stained glass site or through eBay. (The oil in this cutter is green. There's no need to fill the entire cutter. A small amount is fine). Press down on the glass at a 90 degree angle. For straight cuts as shown here, I lean the blade against a ruler to assure that the cut remains straight. (Ordinarily, I would be holding down the ruler firmly with my left hand, but in this case, I'm holding the camera).
Here are two ways to snap the glass .. First is to use the metal back of the pistol grip cutter and with the glass flat on the work surface, tap repeatedly along the scored line, both front and back. Use a firm, but loose grip. Eventually, you'll see the glass begin to separate. Keep tapping until it separates completely.
As a general rule, for longer cuts I use the "keep tapping until it breaks" method .. for shorter cuts, I use the running pliers. Its just a matter of preference. For more complicated cuts, I use my Omni 2 Plus Diamond Wire Saw. Its very loud and takes some experience, but is a great bail-out if hand cutting is wasting too much glass.
Once the glass is cut, the sharp edges must be ground with a motorized grinder. This assures safe handling and also provides a rough surface on which to apply the copper foil later. (Pardon the condition of my grinder .. It gets a lot of use). The grinding wheel spins quickly and is adjustable, up and down, to extend its life. It is kept wet by the sponge (purple one here) which wicks water up from the base of the unit.
Find them here. After grinding, each piece gets rinsed in the sink, dried, and then placed onto the pattern and trimmed as necessary for a perfect fit.
The next post will show the glass cut for all three panels, and the project will proceed from there. Stay tuned ...
Visit my website http://www.boehmstainedglass.com/ to see more of my work .. or find me on FaceBook ..https://www.facebook.com/BoehmStainedGlassStudio Thanks!