After three months you should already have an idea of the monthly values of these groups, except for the Annual expenses, but you can make a good estimate. With these "real" values compare with your income and see how much money will be free each month. If you are satisfied go to step 3.
If you are not satisfied, it mean that your income are very little for what you spend or you feel that you are wasting your money somewhere.
If you earn very little, look how to increase your income. Change jobs or find an additional income. As you has survived so far with that income, it means that you probably can cut somewhere.
Look at where you can cut spending and cut them forever, not for a month or a few months. Think about it: sometimes, when we are very short of money, we have to make "sacrifices " for a while. This means that we have reduced expenses at some point, the idea is to make them permanent .
You will say, but if I'll sacrifice myself all the time, what is the gain? We are not talking about a super sacrifice, you can still do some or most of your enjoys, only if you make it more cheap. This means that we can reduce fixed costs or grocery, without starving. The joys that brighten our lives, we are going to do it with the extra expenses, with what is left of the budget.
You can see an example on this
link, you also can find more in the web.
Lets do this reduction forever. It is the only way for us to start saving money every month.
Again, if there is no way to saving some money, you have to earn more.