Have a plan...you may have to change it on the fly, but have a plan. My invasion happened before working folks had home alarms. There were no cell phones, hell, there wasn't even a 911 system in place in our town in the 70s. We had a plan, my daughter followed it perfectly, my wife followed it perfectly, my dog and I did what we did. I have wondered how different it would have been without the simple chain lock on her door. Man, we took a lot of grief from our friends about locking ourselves in the bedrooms. Afterwards a lot of them did the same. So for us, no alarms, no cell phones, no 911 system. We prepared as best we could and had a plan. My how times have changed! So have our plans. We practice them often.