I haven't found a regular drill difficult to use. I just use some gloves, and hang onto the bit as it turns. Once it has a bit of a groove going, it stays in the groove easily.
I haven't tried glass shops, but I did try tool rental places, and they don't rent out. I have to get some glass cut, so I'll ask when I get that done. Thanks for the idea.
BUT, back to the original question...
Does anyone need any tanks drilled? 