The highest bid wins the auction. You can leave a high bid on this auction. For example if you bid 2500 credits and someone else only bids 1000 you will win with the highest bid but only have to pay 1010 credit not your full 2500 since you only have to overbid the next highest bidder when the auction time ends.
If you know you'll be busy when the auction time ends.... leave a high bid on the auction and hope noone else goes over that bid. If you are the winner of the auction you will be notified via email. Come back to this auction link (included on email) and add your address under Account settings --> Shipping Address, once verified you can add your address to the auction link top. GOOD LUCK BIDDING!!