Not so difficult. I have done three so far, two more to go.
All you need is a good drill press vise, a drill press that you can change speeds, some cutting oil, and patience.
It takes longer for the accurate layout and set-up than the actual operation of drilling.
The Hole needs to be in the center of the hand channel and square with the frame & Arbor.
If you follow Pettifogger's excellent article on the subject, you can not go wrong.