My understanding is that if nothing is done, within two weeks all short-term and revolving credit will shut down. So for you individually, at first it means your credit and debit cards will stop working, and you won't be able to write checks. You'll have to pay cash for everything. That is, if you can get your money out. Within a few weeks, Bank of America, Citi, and Chase will declare bankruptcy.
Oh, and even if you have cash, it will be hard finding a place to use it. Most businesses float their operating expenses for 30 to 60 days on credit because that's how long it takes to process the invoices. When that stops, their whole business model stops. So basically all economic activity will stop, at least for a while. Your company won't be able to make payroll, so don't expect to get paid for a while. Don't expect to go to H-E-B for food, because they'll be closed. Hopefully you know a farmer and can pay cash, or you have a bunker somewhere where you've stored canned goods.
You'll also need firearms, because there will be hungry and desperate people ready to use violence to get some food or some money.
Be sure to avoid heavily populated areas in the cities where the food riots will be happening. Really, it would be better to flee the cities. Stock up on gas now, because once credit shuts down, the gas stations will be closed too.
Conditions will be kind of like Iraq circa 2005 for a while, but really, it's worth it to let the market work itself out. Nations have to be allowed to fail just like businesses.