TE449 valve cover drilling for Zip-Ty breather

Greetings:

I am getting ready to drill my valve cover for breather installation. I have read about some alignment problems, and am wondering if they are only because a hand drill was used. I have a drill press, so I am hoping everything will go well. I will be test-fitting the mounting bolt without the breather, to see if it's centered in the existing hole, and will be using a longer bolt to test-fit breather placement, then either scribe around it, or mark it with paint. That way, I can use the outline for reference as I drill with the supplied step-drill bit. If it offsets, then I will stop short, and finish the hole with a rotary tool. In the event it is still offset, then I will enlarge the bolt hole through the breather, and use a longer bolt with a metal washer on top of a rubber washer, for sealing.

Thanks. I have actually already watched and saved that video.