Part of it is having the mental discipline to understand the distinction between wants and needs. You NEED to pay your rent/mortgage, utilities, car payment, groceries (lots of wiggle room there) and so on.
You DO NOT need to go to restaurants or movies, take trips (no one ever died because they couldn't go on a vacation) or frequent the bars or other pricey gathering spots. Not saying you do any of that but it is a problem for many people. They just feel they NEED "to get away" (from what?) but what that really is, is a WANT.
I suspect that what many people want is more variety and they're trying to buy it with money or credit.
So add up your normal monthly expenses (you DO know what that number is, don't you?). Now subtract that number from your income. If the result is a negative number you have two, and only two, options. You can reduce expenses or increase income. That's it. There is no other way.
If the result is a positive number that's good. Now decide what is your comfort level for an emergency fund. That car isn't going to last forever, the rent may increase or if you own your home it WILL need maintenance, because if nothing is broken all that means is that something is about to break. Don't ask how I know that....