GO SLOW! Keep the water running. Create a template out of wood, secure it with more tape then you think is necessary. Introduce the bit at an angle then slowly lower the rest of the bit down, though this might not be necessary if your template is good enough. Don't push hard. GO SLOW! In all seriousness. I've drilled like 5 tanks and have only broken one (thought it wasnt tempered, turns out it was). If I can put a hole in a tank, you can too. The 10 gallon glass might even be easier since it's less time cutting. Sent from my SM-G970U1 using Tapatalk