As well as you could without pharmaceuticals and equipment.
It's astounding that Miss Mason, who has no familiarity with magic, seems to grasp what eludes you. I can hardly jab my wand and any part of the body I jolly well please and repair and ailment I have no conception of. I cannot reknit ligament without an understanding of anatomy, I can't administer a potion to cure an illness when I don't understand physiology. Magic is a tool, the same as medicines or a scalpel is. An individual who wields them devoid of knowledge is not a doctor, they are a butcher.