If it were me, I'd just keep drinking bourbon until I figured things out, stagger over to the drill press or whatever, and plunge ahead. It's just a hole. Try not to drill through the sides or bottom of the bowl. If you miss, just plug the hole up with plastic wood or something and try again. You may want to read my book, Why I am Not a Pipemaker, by Wilbur Whippit, a nom de plume.