Cutting glass is easy. I used to make leadlight windows and lamps as a hobby.
I use a oil glass cutter like below and cut (score) along a curve you have drawn on the glass. Then turn the glass over and tap it from the other side to make a crack then snap the glass out. I use a knife/tool sharpening stone to deglaze the edges. A glass place or picture framing place can sell you some 2mm glass and some to practice on. It's easy
