It is slow process but it pays off later when big problems come. It may be faster if you know that folks for long time.
-Number is important, but more important are skills of people (and their personality).
-Do not go immediately with organizing for big things (collapse), try to arrange people with more usual things (neighborhood watch or club similar) and build from there.
-As you build from there, look for potential “bad choices” and lose them while it is time.
Most important thing there is to start slow, and with small things, do not “scare” people.