Newly-acquired blood phobia?

About ten years ago, I took a phlebotomy course, and my professor had this advice to give. Go to a specialty store and buy cow/pigs blood (usually asian markets carry it, or some butchers). Then, put it in a bowl, and play with it. Dip your hands in it, paint with it, etc. It sounds crazy, but the idea is to desensitized yourself to it. I personally didn't have to do this, but some people in th course who did were completely cured of their aversion to blood.