This takes time, but once you know the cost of a phone call, putting the dryer on, or a bag of potatoes, it enables you to judge far better how much you can afford to consume.
Once you know the base price, you are in a position to keep your eyes open for a better offer. If you see a discount you can judge for yourself whether it actually constitutes a bargain. For bigger things like utilities it enables you to do a proper price comparison and see if you can cut your bills.
Don't just assume that the premium range is better, try the every-day brand, or even the basic version and see if you spot the difference. Likewise, consider trading down your supermarket from one of the big players to local markets or discounters like Aldi.
If you plan what you buy to match what you actually cook and eat then not only will you be able to budget far more effectively, but you'll also waste much less and find your money goes further without you having to try.
If you can't think of a way to get your meat for less, consider a vegetarian day once a week. If you can't find petrol any cheaper, then work on making your driving as efficient as possible. The more you can think of clever alternatives the less you will have to make painful cuts to make ends meet.