To be able to shoot an intruder the intruder must be armed and about to harm you or your family.
The best thing to do when an intruder breaks into your home while you're there is to get out of the house if possible through another door and call police to take care of it.
You cannot simply shoot an intruder just because they're in your home and you can get out of the home so you have to get out of the house if possible first.
If you cannot get out of the home first and the intruder is armed or about to harm you or your family then you can legally shoot the intruder.
The law states that if there are no signs that the intruder is armed, and they are simply there to steal something then you cannot use deadly force or shoot the intruder.