When a threat appears, adrenaline courses through our veins to assist us in fighting it off or fleeing the area, and with it comes tunnel vision. This is why it's important to practice scanning for other potential threats.
Learning to utilize a pistol when positioning isn't perfect takes practice. This drill will help you become more adept at making accurate shots from various positions.
When looking to utilize a shotgun for home defense, you need to know how to pattern it. What does your gun, in particular, do at various distances?
Entering a home where you might be facing a threat is very dangerous and should be an absolute last resort, but it's worth practicing.