You know I am glad you posed the credit card question. Because this is a serious issue, especially when you are say 18, 19 years old. You can easily and quickly ruin your credit history, which will affect your ability to purchase a home, car etc. or qualify for the lowest interest rates. And I am glad that the responses have gotten your attention and put a little fear in your credit card plans because it will, not can, it will get out of hand. I always tell my son that if you can't pay cash for it or you need a cosignor to purchase something, then you are not ready for it - just wait a little longer until you can either pay cash or buy on your own.
As previously stated purchase items that you can pay off within 1-2 billing cycles. My theory has always been, especially with car parts/repairs or large ticket items, is that I use the credit to purchase it that way I have a "recourse" via the credit card company against the merchant if they do not honor their warranties or the product is damaged etc. Now, mind you, I have the cash in the bank to payoff the balance. I just don't want to give the cash to the merchant just in case I have problems with the product. Remember, cash is hard, better yet, impossible to recover, but with a credit card purchase you can go thru the credit card company for resolution. My suggestion, anything over $300, especially auto repair parts/repair work, should be purchased/paid for with a credit card, in my opinion, for "recourse" purposes and peace of mind if you are not satisfied with the product/repair. Take your time and build you Mustang slowly - choose the most effective part for the money you have. This not a time for trial and error with the money, especially if it's tight. Learn how to work on your own car that way your monies can go to go fast parts and not the mechanic. As a matter of fact, your 1st purchase should be the Haynes repair book - worth it's weight in gold. Gee. I sound like I'm talking to my son. Just be easy with the card. Just One Man's Opinion. Peace
PS. After a couple of purchases, they will increase you limit so be careful.