Drilling is easy, and I never had trouble with 20 gallons, although i'm not sure how that glass compares to 10 gallon tanks. Don't believe I ever did anything with a 10 before. Bottom line is you have two choices...either pay the store a lot of money to do it for you, or pay a store to send you the equipment to do it yourself. Just depends on the route you want to go for it.
Ted---It's not often that I will need that bit, so whenever it happens it happens. I'm hoping to make it to a meeting soon. Speaking of which, when is the next meeting?