lol it's a YT vid. here's a link for u tapatalk users: https://www.youtube.com/watch?v=02wVGvBDunI
it's tricky when u first cut. if u are freehanding it it w/ a hand drill, u have to come in at an angle. keep it wet. have a good, firm, stable grip b/c the drill bit will dance across the glass until u get a groove.
here's another confusing thingamajig.