Step 2: Drilling

Picture of Drilling
Now for the easy, but repetitive, part.  Load up your drill and start drilling each hole you punched in Step 1.  I found that a faster bit speed made for cleaner holes with less burrs that I had to file down after the fact.  The picture shows my chosen hole pattern after I completed the drilling.  There isn't much science behind the pattern itself, so go with whatever you like.