1. Don't depend on electricity or civilization.
2. Get really good at the tools and techniques of tracking, hunting and war.
3. a) Have lots of kids and b) have enough trustworthy confederates who can keep their mouths shut.
when that thing hits the fan, "trustworthy" or "brother" takes a whole new meaning. But, yeah, far, far away from people and get ready to go back 5000 years. Just in case. To be prepared for a lot of people costs next to nothing, but rewards can be immense. So it pays to be prepared.
I mean in and of themselves your steps aren't wrong per-se. It's just that things don't work out like you think and the people that call themselves confederates and encourage each other to be baby machines I imagine won't be very workable as a post-apocalyptic relationship. With outside groups or each other.
Meanwhile, these population centers tend to spring up around a social pillar for a reason and don't simply lose that robustness when the public works begin failing. People are way too quick to assume they're the only rational one surrounded by rabid beasts.
But keep on preppin', california cowboy (sorry couldn't resist, this sounds city boy af and you have it in your username).