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If you can get your utilization down to about 30% or lower, you should be fine. It wont affect you in general but if you cannot bring it down in one payment, its best to pay more than the minimum payment to try to pay it off faster, but if its just going to be one month, then youre fine. People carry a balance all the time on a card, especially for large purchases. Though this may not be the case, but you dont have to panic.
Carring a high balance for any sustained period could, depending upon the criteria of the creditor, trigger a review for a decrese in your credit limit. That alone, if done, will result in a future increase in your % util due to a reduction in the denominator of the calculation.
I dont know the triggering criteria for a CLD for your specific creditor, but I would strive to get the % util under 50% as soon as possible.
As soon as you get your utilization below 30% you'll see an increase in score and when you get it under 9% you'll see a "full recovery" - that is assuming this is your only card, should you have multiple cards it has to do with overall utilization. Frankly, I've run my Discover up over 70% and carried that for a while (Balance X-fer offer) with NO ill response from Discover.
Of course, I have a lot of cards and a lot of available credit, but also I have a long history which helps ease lenders' concerns (other than Comenity and Barclays perhaps).
Given how you have described your situation (including the followup posts) you should strive to lower the card's balance as swiftly as possible. The problem is that this is your only card. Therefore both your individual utilization AND your total utilization are over 70%. (With total U a person considers all his cards together.)
If you have friends or family that would give you a short term loan to help you lower your balance to less than 67%, that would be a very smart move. Ideally you want to get that balance down to under 67% before the next statement prints -- that would be a huge step toward protecting yourself from Discover closing your card or sharply lowering the credit limit.
Even better would be if family could assist you in lowering your balance to under 47% and then consistently make over double the minimum payment.
Sounds like you have a good plan. A utilization of 68.99% turns out to be a pretty critical breakpoint for CC issuers and for FICO. If there is anyway you can get under that before the next statement, that would be a great move. You estimated that your utilization would be 60-70%. 70% will be viewed very differently than 67%. The 68.99% figure includes interest, fees, etc.