Okay, I think I can just skip the part about WATCH OUT, HERE IT COMES. It's here. Now what do we do about it? First, assess your status and position. Where are you? What do you have? What do you need? How do we get what we need and how to we do all this stuff?
It is most important to have a place that you will not lose or be thrown off. McMansions are probably not the best possible place, but not entirely a loss, if you aren't upside down in your mortgage (owing much more than it can be sold for). Essentially, where-ever you are or will be by the next summer is where you will probably stay, unless you are a loner or a member of a nomadic group. Just assess the possiblities for gardening (even a small garden is a big help), heating alternatives, transportation (by other means than a petroleum powered vehicle), possible neighbor co-operation, and the list goes on.
What do you have that is useful or can be made so? Solid stable clothing, especially shoes are vital. Toilet paper (don't laugh, imagine using leaves or old newspapers), is a necessity, in quantity. A communications device (CB radio is a very good idea, don't count on cell phones). Pardon me, but guns are absolutes, and the ability to use them (do it now, before they disappear and get lots of ammo). A heavily stocked pantry, especially canned food (dried is nice to store, but if water becomes a problem, or heat, you can always eat right out of the can). Store some water, if you don't use it it makes a great heat holder. The latest CD's and DVD's are very far down on the priority list and so are video games, to say nothing of jewelry, geegaws and frou-frou. If it doesn't help feed, shelter protect, defend or water you, and it cannot be incorporated into those areas, ditch it, try to sell what you can and then go get what you can find that you need.
What do you need? Whatever you haven't got from the above list and scads of stuff we never think about (a sturdy bicycle, for example). Seek all possible sources, thrift stores, auctions, garage sales, etc (and don't forget the penny saver or the local gunsmith).
Learn skills that have been out of fashion in that regular world(canning, drying food, gardening, fishing, hunting, trapping and snareing for food, sewing, walking (long distance five miles or more and I know we can't all do this), conversation, and again the list goes on and on). Practice, especially tact, barter, shooting, and ask your elders, who have lived through the great depression #1, how to do things.
We are not where we want to be, and with the price of transportation rising daily it isn't likely we will soon be moving so we are getting ready to try to survive here. Our garden is being expanded, we are starting to exercise by walkiing and we are exploring those areas we need to improve. The thing I fear most is the apathy which is rampant in our world, so we must get the word out, even when those we are speaking to are not receptive at first. If we don't we might just find ourselves alone and without help when we need it.
Good luck, and GOD bless us all, though I'm not at all sure why HE'D want to.