The best way to protect yourself from predatory lending is to be informed. If you ask questions, read all documents, and know your rights, you'll be better armed to identify and walk away from a bad lender. When you're informed, you can protect yourself and make sure you get the best mortgage for your needs.
You have a legal right to have - in writing - the total cost of the loan, the annual percentage rate, the monthly payments, and how long you have to pay back the loan. Always ask questions until you understand everything.