How to start

[Hawkeye]

I would suggest setting the height so that, when you hold your forearm parallel to the floor with your hand flat, the top of the vise is right about that level. That's where mine is and it works fine for me.

Long sleeves aren't recommended around spinning equipment, so it pays to make up some kind of polycarbonate shield that you can attach to the head of the mill so that it stays between the bit and you. A magnetic stand for a dial indicator is usually the most versatile for this purpose.