I drill my own holes and it's not difficult. Maybe if you are using some extremely thin glass it could be, but from my experience the process is no more difficult than drilling through wood, just a hell of a lot louder, messy, and takes longer. The risk of glass breaking seems pretty low if you do it properly, and I can't imagine spending more than 5 minutes to drill a hole through glass so 20 bucks for 5 mins and the cost of the hole bit seems high compared to DIY. Keep in mind that they probably are keeping their prices competitive to other local shops so if everyone is charging that then they are justified in their price. But give it a go yourself, one of the easier diy's to do. Plus It would prob only cost you around 20 to 30 bucks to do yourself but with as many holes as your saw is good for, I am on 25 with my bit and still going strong.also, my local glass shop charges $20 for 1 hole in glass. i feel that's outrageous, but what do u think?