When does the term end on these 0% cards though? Once the 0% period ends, although the quoted APR doesn't look as high, I know that I'm paying more interest on each £100 of credit card debt than when I go overdrawn. I used to be quite good but got into a bit of a mess, and am now hoping to pay my cards off. I've just paid off my mortgage and am not applying for another though, so I'm looking at trying to pay off more sooner to get rid of the debts and pay them off.
Try to break the habit of putting day to day spending on your cards - if you haven't already, you will get to a point when you've effectively spent your income before you get it, and while it might seem affordable now, if your circumstances change, this is grim.
Make sure that you have the minimum payment at least set up by direct debit on all of them now. Add up your outstanding debt. Add up your current minimum payments. How much can you afford to repay each month? At each, look at when your 0% ends - if you don't make more than the minimum payments, you will be paying more in interest, charges etc than you will on the credit cards. then it will take forever to pay them off. Credit card companies are supposed to warn you if they think this is happening to you and you are getting into persistent debt. Also, look at the interest rates - I hadn't even realised that one of my cards has over 26% APR, compared to 18+% and 19+% for the others - at my age I really should know better.
Try to get your regular outgoings like food shopping off your cards back on to your current account before the 0% ends, and work out how much is left after rent, essential bills, food and other necessary stuff out of which to make your repayments. Then I would suggest paying off the most expensive debt first - for example, if one ends months before the others start trying to reduce it first before the 0% term ends. If you have to pay interest on more than one or all soon, then once you've made minimum payments, I would prioritise the one with the highest APR.