Setting up a budgeting worksheet isn't a hard chore. In fact, if you like using spreadsheets it can actually become quite enjoyable. The beauty of a budgeting worksheet is that you can see all your numbers at a quick glance in an easy to read format. It's instantly editable so changes can be made on the run and will save considerably on white_out. And perhaps the best feature, is that you can always keep a history of your transactions (depending on your hard_drive space).
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.