1. Actually opening the mail.
2. Looking at my checking account online and writing down allllll the checks I have not written down in my checkbook
3. Subtracting said checks from the balance in my checkbook (remember subtraction?) so I will know how much I have.
4. Paying the bills as they come in, not stacking them somewhere unopened.

Despite my haphazard habits, I have not bounced a check or failed to pay a bill at least semi-on-time. But the former bank teller in me recoils at such laxity in financial matters. Must do better.