I used to be a die maker. We drilled through 3+ inches of tool steel over and over all day long. A good high speed steel drill bit will last a long time if you use the corrct speed, enough pressure to produce a chip that comes of in a curl, and a coolant. A water soluable oil coolant can be purchased at any machine tool supply store. Sharpening a drill bit by hand is easy. You just need someone to show you how. I'd be glad to if you're in the area.