The most common budgeting method used is a blank piece of paper. We've all tried it at one time or another. Income is listed on one side, expenses on the other. The idea is to balance income against expenses so that, hopefully, there is still some money left at the end of the month. _ There are at least a couple major problems with this method. First, it's pretty easy to overlook quite a few expenses. Things like that daily stop at the coffee shop, or the cost of a car registration that happens only once a year.
Consider putting yourself back on cash. If you think you shop impulsively because it is so easy to use plastic, try to give yourself a cash allowance every week. You may go over the allowance, but you will have to go to some effort to replenish it. This can be a great way to get a handle on spending.