^^^^^^This
If you have never deployed it pick a tree and pratice. Be mindful of the wind. This will give you an idea of the effective range and what you might experience from the spray. Don't do it in populated areas and save it for the camp or back forty. If you have respiratory problems or contacts take extra caution.
If you get it on your hands throughly wash it off with water before touching your face, your plumbing, or wiping your backside.