I've been into branding for a while now. My ex and I did some really sketchy work with various metal objects heated to red hot and dragged across the skin. They didn't stay around for very long, but they came out all right considering. I was thinking about buying a cautery pen so that I could do some more professional-quality work. I'm a decent artist and I've got a steady hand, but what else should I know about this before I get to work i.e. sterilzation, planning, etc?