[baselle]

I've found that the best way to break a bad spending habit is to supplant it with a good spending habit.

Also, if you have any success - any savings or you've reduced your debt in some way - write it down along with the date on a slip of paper/post-it and put it in your wallet, preferably in front of your credit card or debit card. When you're tempted, look at it. Reminding yourself of even a small success should help you.