Personally I think xNTJs make great bosses. I guess the best position for an xNTJ is to be the owner of a business. That way you can set your goal and employ the sort of people who want to work hard with you to get there.
But in other cases where you are an employed manager and someone else already hired the staff the best thing is just to figure out what type of personality each member has and understand things from their point of view. Like someone else said everyone is an individual so they have to be treated differently to suit their type. Some people will never understand your xNTJ style but at least if you try to see things from their point of view things may be a little easier.