Cutting thin strips can be challenging. If the score is not perfectly straight, or if you do not tap the glass enough times, or if the glass just decides to be weird, the strips will break exactly where you don't want them to. Its very frustrating and it can be expensive.
The two nearest stained glass stores are each a one-hour drive, round trip. Neither of them generally carry the exact glass I need for a particular project. And since neither store has the inclination to say over the phone what they have in stock, they require an in-person visit. When I'm in the throes of a wonderful project, the last thing I want to do is leave my work and make a one-hour round trip, only to come home empty handed.
I use two wonderful online suppliers who are better stocked, but they both have minimums and a two- to three-day wait for delivery. Neither option is good. The best option is to buy enough glass, allow for breakage, and then do everything possible not to break what isn't supposed to break.
Quite by accident during the course of this window, I discovered a better way to cut strips without using running pliers. I successfully used this technique to cut most of the strips in the window. I also cut a 15" x 2" strip with no issues. Try it.
Boehm Stained Glass Studio website and FaceBook site.