Hi, I've never drilled a mirror before and I need a little help, I'm mounting two wall sconces over a bathroom vanity and need two small mounting screw holes and a small hole to accommodate the wiring for each sconce. A 4' by 5' mirror is on the wall it sits in a bottom channel and is held in place by two plastic moly clips so the mirror is removable.

Thanks
joju11

Take it to a glass shop, they use a diamond bit with the correct coolant. They will say we drill at your risk, but small holes are no problem.

Hardware stores do sell bits to drill glass. A 4' x 5' mirror might not be a good project to learn on.