You should be able to document your income, expenses, and (hopefully) savings every month. If your income minus expenses is a positive number, you can relax a little. You still may want to work on your budget so you can save more for an emergency or retirement. If that number comes out negative, you could be in big trouble. Spending more money than you make means you must rely on credit. In turn, this means you are setting yourself up for more trouble because those credit card payments will get higher every month.
The use of budgeting worksheets will make the process of creating and maintaining a budget so much easier. Many people don't live within a budget simply because they find the process of creating a budget so overwhelming. While it can be difficult to account for every dime you spend across several categories, the rewards of doing so can have a huge, positive impact on your future.