Go slow, step your way up in bit size, good bits and oil, and as previously stated, beware of the dreaded “speedslap” when you are bearing down with the drill against your chest for support. Just as your are about to punch through with big bit, the bit catches, your wrist gives out, drill comes out of hand, and drill hits you in the face three times before you can get out the way>:. Do lots of metal fab and have seen it many times…