Great advice above, but I'll add caveat. If the bit you're trying to sharpen is truly made from high speed steel, you cannot remove the temper with a grinding wheel. You can discolor it, for sure, but the temper will remain. If you heat the bit cherry red and let it cool, the temper comes right back. The bit may be crooked, but it still will be as hard as when you started. I'll always choose HSS twist drills for modifying to a woodworking brad point. Truthfully, I don't think I've got any drill bits that aren't HSS and I've got hundreds of twist drill bits.
Hand sharpening takes a little study and a little practice to get a metal working type tip, but not a lot.
Some cheapie twist drills aren't worth the time to sharpen because of their terrible flutes and lack of straightness.