Really it is not as scary as they try to convince you. It is scary for them, not for you. I survived at least two economy collapses, and even does not account them as some serious events in my life.

So few recomendations from economy collapse vet :) :

1. Do not keep you wealth in fucking fiat paper, bank accounts, stocks, treasures, whatever shit you don't control. I would not recommend even prescious metals, since you will definitely have problems exchanging them for food or whatever during and after collapse. Many really did here. Bottle of booze or bag of potatoes is always much better and more liquid currency in times of real collapse, than anything that accounted as such by any "consensus". Well, may be some untoucheable long-term savings you could keep as precious metals or realty, but not the savings for planned large purchases or like. Better spend it for something useful, because you will not have large purchases duiring collapse.
2. Don't take in mind prices. Prices are relative thing. More important how many food/things you could buy with your income, not the absolute value. If you are an employee, don't hesitate to demand your salary to be equivalent of real things. Say, if a loaf of bread cost $1 and you paid $20 per hour, then regardless of current prices demand salary on the basis of 20 loaves of bread per hour. If you are enterpreneur, don't hesitate change your prices accordingly, to keep yourself and your employees satisfied. You will not always be able to do that, so next 2 points is really vital.
3. Spent part of your pay immidiately to stock with food/things in amount enough to be fine till second next payday.
4. Own property/realty where you could live. Even small and cheap realty is way more better than any cool and comfortable rent.
5. Make friends with local farmers, servicemans, medics and so on. Don't even try to measure your friendship in money. Help them just because they are your friends, not because you want something from them. When you will be in need, with high probability they will do the same for you. If some didn't - they are not your friends or you failed to be a friend. Don't worry about spent time and efforts - even if you mistaken about friendship, good things you did to somebody will inevitably return to you, sometimes in a very unexpected and amasing way. It's not even about barter, it's about relationships with other people.
6. Most importnat - GET SOME REALLY USEFUL SKILLS! Learn to weld, or drive a tractor, repair electronics or do plumbing. Whatever you think you could do or have talent to. If you can do something real and necessary for others - you will never find yourself on the bottom.

These are basics, I hope more or less international, of course there are more things that important or useful in time of collapse, may be more nation specific, IDK, Americans could find new opportunities, f.e., they are good in that, others could find something else, but I thinlk you will easily figure it out by yourself. :)