While I agree with the Federal Trade Commission (FTC) that there are things that a credit repair clinic can take care of for you legally that you can do for yourself with little or no cost, what makes the credit repair clinics successful is access to the inside tactics and techniques. This involves strategies such as "Proof of Contract", "Constructive Notice", "Challenge of Procedure" or "Restrictive Endorsement" and many others.
The question you have to answer will be what are you trying to accomplish and how much time will it take you if you do it yourself? Remember, you get what you pay for. If you pay little or nothing, expect little or nothing in terms of your results. If you've got more time than money, do it yourself, but make sure you have the right kind of information. If you have more money than time, have someone else handle this for you.