Another comment to add to the way you sharpen the tungsten - if you don't have a drill, you still need to sharpen it perpendicular to the grinding wheel. Sharpening tungsten from the back of the wheel tends to eliminate poking the tungsten through your hand occasionally - not as exciting but sometimes boring is a good thing... MANY years ago we were taught that if you grind the point "sideways" the grind marks can interfere with the gas flow but grind marks running with the gas flow minimize the problem. You can count on eating up your grinding wheel, too!
Also, just barely touch the tip of the sharpened tungsten to the wheel to prevent having a small point that breaks off and contaminates your weld. And don't forget to clean your filler rod with emery cloth.
Last comment but shouldn't affect anyone here - tungsten is radioactive. Not enough to worry about - about like granite but if you're welding where they have radiation detectors on the way out and some "friend" slips a piece in your hip pocket you ain't going home till you find it and explain.