What is an appropriate tool and technique for this?
Thanks
50 caliber machine gun???
Seriously, pilot hole then a unibit or a plumbers Greenlee Punch.
I use some regular old Lard for lubrication when drilling SS. Best thing I ever found. Better than cutting oil. Turn the bit slow, start with a dab of cooking Lard on the tip. pilot hole then unibit like some said. I keep some in my hangar fridge so it remains solid.
Jim