It's honestly not that bad at all. Have you tried to practice on a junk sheet of glass yet? If not, I highly recommend doing so. Thats what I did to get started. I drilled 4 holes before even touching my main tank. All came out great in the the Practice runs, so I did my main. Aside from a few small chips on the outside when the bit came through, all went well.
The worst part IMO is getting the hole started. I learned the best way is to brace the drill with one hand on the glass and drill, hold the bit at an angle so that just one tiny part touches the glass first, then slowely start angling the bit so that it's flat and 100% of it is touching the glass. This works great.
I also had a garden hose pouring constantly on the bit/hole for lubrication and it worked great. It also washes away the glass dust.
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They call it addiction for a reason...
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