When to are talking about budgeting you are also talking about discipline,. They both works together because you can't talk about budgets without being principled on how you used and spend them. To make a successful budget and it comes true there are some random and oscillatory movement you would either stop or avoid in order to maintain within your budgets otherwise, there are chances that you will still spend above. But what to do is that if your income is like 500$ per month, and you budget to spend 80$ before it runs out, after you receive salary send out 400$ to savings or any place you wish to store it then send out 50$ as emergency fund, spend the remaining 50$ as budget when the funds doesn't serve you then you go get to emergency funds to spend as well because already your initial budget is 80$ and 20$ was a kind of addiction to sustain you.