Been gone a while, had to go make a buck. After reading some of the above comments some of which are really good advice, and some not so good, I just have to kick in my .02-in a friendly like kind of way. Sooooooooo:
1. You had better identify your target before you shoot anything, unless you want to spend some time in close confines with a very lovable guy named Turk. Or in your own personal hell if you shoot/kill a loved one.
2. The operative word in home defense is DEFENSE. That means take a defensive position. There is no one, including myself, on this forum who is capable of safely clearing his own home alone, unless he lives in a one room cabin out in booneyland, and that may be iffy. If you go offensive, you risk life and limb, and possible legal problems. Between my wife and myself, we have 45 years of active military, and 40+ years of LE experience-all of it in high activity/ high speed areas. My wife is still on her big city SWAT team (she fits in spaces big guys won't), and we have probably have cleared thousands of buildings between us, and we have agreed on a static defensive position for defense of our homes, that keeps us and the kids/grandkids safe, and lessens the possibility of any gunfire. Remember, ANY gunfire in ANY home is dangerous to ALL in the dwelling, your mission is to prevent gunfire if at all possible.
3. The only thinghies on our defensive weapons are a weapon mounted light, handgun or long gun, and a butt cuff for the shotguns with ammo. The light will help much more than it hurts or hinders-remember-defense!
4. Birdshot is for birds, and sometimes it don't work on them! If you are going to shoot, shoot with something that will stop your enemy, not just hurt him. Our HD weapons consist of: 12 gauge, .38 special, and .45 ACP. The 12 gauge load is buckshot, (I like #4 or #1 for indoors).
5. Light is your friend: We have motion activated outdoor lights (the solar powered battery type, and regular hardwire). Inside I have installed numerous of those LED AAA powered motion lights, they are cheap, and fit almost anywhere, anyone walking through the house will trip them, letting us know where they are, they are also nice for when we enter before we turn on the lights. Had them for 9 months now and have yet to replace a battery.
6. I am prepared to defend my loved ones lives with my own, but I am not going out by being silly. If a BG wants me he is going to have to come and get me, and I am quite certain he will fail because I will know where he is, and he will not know where I am, and I will be well defended and the BG will be prowling around. I am NOT going to try to scare him by clanking a pump gun around, I will try to stop him dead in his tracks if he becomes a threat-even a little threat.
7. Speaking of threats, you are going to have to be able to articulate the threat you were defending yourself against, sometimes to not so sympathetic authorities. It will be more difficult if you have been aggressively prowling around looking to shoot the BG and not trying to stay away from him till the police get there.
8. Speaking of the police, you had better have called them(from a legalistic point of view), and when they are on the scene, and you are sure they are the police (by calling 911 back if need be). You want to notify them where you are and that you are armed. Then when you present yourself to the police be UNarmed, no sense in getting killed accidently after everything is all over.
I know someone will take exception to my viewpoint, and no doubt there are some folks out there who have a better idea, to each his own. However I plan to survive a HD event, and have no legal problems thereafter, and most importantly, have all my people come out safe and sound (and not too traumatized).