Credit scoring models usually take into account how much you owe compared to how much credit you have available, called your credit utilization rate or your balance-to-limit ratio. Basically it's the sum of all of your revolving debt (such as your credit card balances) divided by the total credit that is available to you (or the total of all your credit limits).
You'll find a lot of helpful information under the Credit Education tab. Ovation keeps their blog updated regularly on topics ranging from Bankruptcy to Payday Loans and much more; if you feel a little lost just browsing through the most recent posts, you can click on any of the topic categories on the right side of the page, underneath the Recent Posts header.
The honest answer? Yes, and no. Credit repair is a great way to improve your credit score, if the problem is caused by a disputable error. If your credit score is poor because of a giant pile of debt — debt that you legitimately owe — then credit repair may not be the right solution. Determining which path to take will be based upon those considerations as well as any other factors that may be unique to your situation — and this is something only you can decide.
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After you’ve resolved the negative items on your credit report, work on getting positive information added. Just like late payments severely hurt your credit score, timely payments help your score. If you have some credit cards and loans being reported on time, good. Continue to keep those balances at a reasonable level and make your payments on time.
Of course, if keeping accounts open and having credit available could trigger additional spending and debt, it might be more beneficial to close the accounts. Only you know all the ins and outs of your financial situation, and like thumbprints, they're different for each person. Make sure you carefully evaluate your situation; only you know what can work best for your financial outlook.