This is an easy one! I would tell myself "threats of things going on a credit report does NOT mean you can't get a credit card. It means you can't get ANYTHING without cash and a bank account." I would tell myself never to get an eviction on your report. And I would tell myself "listen to the man who forewarn's you that you will see demons. He is not as crazy as you think."
I would like to think my life might not be so complicated if I would have given myself this kind of advice.