I use AutoCAD 2000
punch... as in use a sharp nail or preferably a punch, and a hammer(NO Not the CPU)

, then gently punch an small indentation into the copper, exactly where you want the center of each hole to be. This will prevent the bit from drifting off target, while you drill...
once all the holes are punched it's as easy as
this
the end resault should look something like this.....
