Don't quit your job or change jobs.
If this is likely to occur, consult with your loan office and real estate team.
Don't apply for credit anywhere else except with you lender.
This causes more "hits" on your credit rating which can reduce your credit score.
Don't change bank accounts or transfer money within your existing accounts.
No large undisclosed deposits.
Don't co-sign for anyone, for any reason, for anything.
Don't charge any abnormal amounts to your current credit cards or credit lines.
Don't purchase or attempt to purchase anything else on credit.
Such as another car, truck, boat, furniture, appliances, or other real estate.