Tapping PCV hole on MP Perf. Valve Covers..

Got my new MP Performance black valve covers, and the PCV hole has to be tapped out on the drivers side cover for my Holley. How have you guys done this? Instructions say just to take a punch and a hammer and punch it out, then round file it down. Anyone have a better/cleaner suggestion? A hole saw or something?

Thanks! Just thought I'd ask, you never know when someone has a good trick...