the link is in my post,the reply to your first quesion.
yes the iron will sting,but that is part of it. how many hits do oyu think you are getting in 2-3 min.??? you need to start with at least 50 hits on each of the striking surfaces you are going to condition. do arm swings and qigong apply jow,hit bag,halfway through apply more jow and arm swings,then the last half of the strikes,apply jow,arm swings and qigong. you will see great results after 100 days of hitting steel.