I used a Dremel with a diamond bit. The diamond bit works similarly to sandpaper and as it spins it sands away small amounts of glass at a time. It makes tiny shavings of glass that are too small to cut you it’s exactly like sawdust just white. And finally it doesn’t shatter because I’m adding water to make sure the bit doesn’t heat the glass up so much that it cracks. If you have more questions ask them and I’d be happy to answer them.
If it’s more of a passion project you could start a little social media gig where you just record the process and whatnot— then you could have a little online gallery and post them as “exclusives”, put a starting bid of maybe $50-80, and then let the bid stand for a week or until next design concept.