holes in sheet metal
What is the best way to drill half-inch diameter holes through sheet metal that I can't easily move around. I am talking with a hand drill and I want to avoid twisting up the metal in the fluorescent tube fixtures when I install switches to control them individually.
Should I clamp a piece of wood on the back side?
Will a small pilot hole help, or hinder?
Will a special type of bit make it easier?
Is cutting oil helpful with thin metal?