I used a 1/2" hand drill moter in a vise. I wouldn't suggest you do this unless you have some experience running a drill for fabricating stuff. I'm an electrician so I've done more of it than I'd like to admit out in the field -often using my feet as a vise. I did have the help of a step-drill (unibit) to help me get it close and then I cleaned it up with the appropriate bit the rest of the way.

A drill press with a good press vise would be best but it CAN be done without it. I don't take any responsibility for broken/bent bits and/or wrists if you don't heed this warning