Firstly. Make sure you read the terms and conditions of the card to which you’re transferring your balance and are aware of exactly what you’re signing up for. Some cards, for example insist that you spend a certain amount per month on the card in order to qualify for the interest free balance transfer.
Secondly. Never, never, never spend any money on the card to which you transfer a balance. This is because, your monthly payment is always put towards paying off the transferred balance. This means that you will pay interest on everything you spend, even if you pay off as much as you spend every month.
Finally, make sure you know and write down the date that the balance transfer period ends. Better still, set an alarm on your mobile phone or PDA for seven working days before the expiry date. That will give you enough time to pay off the balance before the interest free period ends.