I think getting a credit card yourself without any proven or reliable income will be difficult. You might get the card but I feel the credit limit they will offer would be very low (maybe £500 like a student credit card). So this would mean getting a lot of cards to cover your £8000. Then you won't be able to move them to keep 0% as you will have been issued all the different cards.
Have you got a partner or relative who would be willing to get you a card in their name? Preferably somebody who is low risk on high income to increase chances of getting a good limit. I had a £4000 credit limit with Virgin on 0% for 12 months.
What interest rate are you paying on the loan?