Train and mindset - it seems the OP wants a discussion of what megablaster to deploy so you can John McClane the guys.
Have good doors, locks, windows, alarms, dogs - or whatever to delay entry. Have lock on the bedroom door.
Train to avoid fear, freeze responses and have good processes programmed in for appropriate actions.
If someone just materializes in your door with a gun pointed at you - you could be toting any old gun and you are shot dead. Even a Taurus Judge in each hand won't save you.