These folks did it exactly right judging by what is being reported:
Edmond homeowner shoots intruder
If you have another person in the house with you, then one of you calls 911 and the other covers the door. Do not go "clearing" your house like a ninja commando. It is an unnecessary risk. If you live in a state that has Castle Doctrine on the books, then you have no duty to retreat. Light the scumbag up if he or she comes through the door.