CheckoutConfirm and ManualPaymentProcessor

Hi,

in CheckoutConfirm page the sytem first place order ( OrderManager.PlaceOrder(paymentInfo, NopContext.Current.User, out orderID); )

then post payment ( PaymentManager.PostProcessPayment(order); )

i use ManualPaymentProcessor and when i try to talk money from credit card, it can be some problem,

if some problem what must i do, will i rollback all order place?

what must i do?