Make a conscious effort not to jump into your car and go to the store because you think you need something...
Everytime you go shopping on a whim... you end up going to get a loaf of bread and come home with $80 worth of groceries... I hate when I do this..
Set aside one day of the week where you go shopping for groceries
and stick to your grocery list. Then that is it. No more, finito.
Avoid "boredom shopping" - especially on the weekend when you have too much free time and think that going somewhere will alleviate boredom. All you end up doing is spending money...
Stay home and read a book, watch T.V., go on Yahoo Answers and answer questions. Do anything possible to keep you at home where you can't spend money.
When you do go shopping because the fridge is empty and you are on the last roll of toilet paper... buy in bulk. It gives you more for your money and you won't be forced to go and buy T.P. so often when you bought the 24 pack deal instead the 4-pack.
Make sure you have enough to last a week (or 2 weeks for essentials that will force you out of the house to go shopping... I hate toilet paper it is really something I can't do without... grrr).
Never go shopping when you are hungry.... you will buy more than you really need. Take somebody with you that has the job to constantly remind you that you have a list and you are only supposed to buy what is on that list. My daughter loves this job.... about the only time she gets to critizise Mom openly in a the store and in front of public....
(We have set rules for this job... I can't overrule her or get mad... she is just doing her job...)
If you are like me and simply suck at making a bag lunch to take to work then give yourself a set allowance for lunch. Mine is $5.
And I will only leave the house with $5 in cash... that will stop me from swiping my ATM card and spending too much on lunch, snacks and Starbucks... I really, really miss my iced white mocha... sigh...
Overall - make a budget.
After you deduct the amounts you need for rent, utility bills, phone and cable... AND regular savings, take what you have left and divide it into the following categories: gas for the car, groceries and toilet paper... grrr. and only what is left.... is for you to spend without thinking about it. :)
And have some patience with yourself... no body is perfect and can jump into budget mode going zero to 60 in 3 seconds. There will be set backs... don't worry... nobody is perfect...