Hood Pin Install

I want to put some hood pins on a 70 Swinger. I know the holes are already in the bottom side of the hood and the top of the fender, but i am a bit nervous about drilling in the hood. Any one have any tips? I was going to get a good step drill bit and go from there. Should the hood be perfectly aligned? Or do i have a little bit of play room to work with? The hood is pretty aligned on the car. Not perfect but pretty good id say.