Before you clear . . .
1) Make sure your home is difficult to break into. New locks, sturdy doors, and windows that are locked and safetycoated. Motion activated lights covering areas an intruder might like to use and an alarm system aren't bad ideas, either. The point is not to make your house impossible to break into, the point is to make your house very hard to break into quietly. This way you'll have at least some warning that there's a problem. Most houses, if you hear a funny noise it could be anything. In your house, you want an intruder to activate lights in the yard, kick your door three or four times and then set off the alarm. At that point, you KNOW there's a problem.
2) Arm yourself. A home invasion will be fast, and you may have only seconds to be ready. You won't need to worry about clearing techniques, because it'll be the bad guys using them against you. However, 99.9% of noises are not a gang of jacked up psychopaths coming to kill you. That's why step 3 is . . .
3) Wait a moment. Plenty of groggy homeowners have shot down neighborhood drunks who wandered into the wrong house (maybe through an unlocked door or one that was easy to break down). Plenty more have shot their own kids, sneaking in late at night. Waiting not only improves your reactions, it gives you a chance to assess the situation. If you wait for 30 seconds and don't hear anything else, there's a better chance it's nothing. Two to four guys breaking into your house are going to have a hard time remaining totally unnoticed - especially if you followed rule 1 and made it hard to do in the first place. If your wait reveals nothing of interest, then go to . . .
4) Secure your communications. Maybe you'll call 911 at this point - especially if your lights have been tripped or your alarm is going off. Maybe you'll just grab the cell phone. If you're going to clear solo, even though you are pretty sure there's a problem, you'll want to call 911 first. If you get shot or stabbed there's at least some chance that you'll still be alive when help comes. If you leave the phone behind and get jacked, you're going to have to hope that you aren't finished off by your assailant, and that you live long enough to call 911 and for help to come to you.
You can do all of this without attending a single tactical school or even lifting a screwdriver (if you're willing to pay your locksmith, etc). If you're handy, much of this can be done for pretty low cost.
If you've prepared your home in advance, the odds are burglars will leave it alone. Those that don't will almost certainly give you plenty of warning by setting off your alarm, or bashing away at your doors and windows. Armed with that knowledge, you can call 911 with a .45 in your hand and the decision to clear or not is totally up to you.