Ok. Basically what you will need is a dremel, bit #7103, bit #7144, and some playdoh. You start off by building a mountain ridge out of playdoh around the area you wish to drill. Then you pour maybe 1/8" of water in the valley you just made(the water keeps the bit and the glass cool). At that point, with the #7103 you trace the perimeter of the hole you would like, gently carving into the glass. You just keep going in circles until the piece drops out and you have your hole. Each 1.5" hole took me 1 hour. After that swap out bits and use the 7144. You will use this bit to smooth out the hole.
Its very simple. Just be careful. Anyone can do it just pay attention and be aware of what effect different speeds and angles have on your progress. Hope this helps.
You can buy the bits at Walfart.