Serious advice: 10% of your take-home pay should go into a separate 'rainy day' account. A further 10% should be set aside for property deposit. Whether that is 10% of the total take-home or 10% of what's left after your Rainy Day Fund contribution is up to you.
And yes, it's tough; yes, it's not fun...but at some point you'll be glad you did it.
Remember also that, while overdrafts, loans and credit cards can be helpful in a pinch (though if you've saved you should never need to go overdrawn), it is NOT free/extra money to spend. It is debt, pure and simple. Do it in an emergency if you absolutely must, but otherwise steer clear. If you do put something on a card - an urgent car repair so you can get to work, say - leave it at that and get it cleared asap (and never, ever just pay the minimum required; always pay the minimum plus 10-20% if you can and remember to factor in any payment protection charges - they don't always get added to the payment advice. Preferably you'd be able to clear the lot, but that'd depend on how deep you'd gone).
If you get stressed (and you will), do not take it out on others, especially at home. It's not their fault and there is nothing they can do to change it.
(Beware, though: this one is very much a case of 'easier said than done'. Just remember that they don't have to be there, and if you don't get a handle on your sh!t, they won't be for long.)
Look after yourself. Seriously. You'd be amazed at how quickly your fitness and health levels can (and will) drop if you don't take care, and it's insidious because it happens without you noticing in the day-to-day.
That's not to say don't enjoy a beer or burger or stuff from a takeaway. Just keep it in moderation. That little racing bike tyre that appears round your middle can become a motorbike tyre, a car tyre, a truck tyre PDQ. Keep the weight off. If nothing else your knees will thank you later on.