Having said that, the other posters are correct. You can settle debt on your own without the help of a debt settlement company. It does take a lot of time and energy though. That is why some people choose to use a company to do it for them. Due your due diligence and search for reviews of the companies you are interested in and see what others have to say.
A debt management plan sets up a payment schedule for you to repay your debts, with the goal of helping creditors receive the money owed to them and ultimately improving your financial and credit standing. By voluntary agreement, you deposit funds with your credit counseling agency each month, who sends those funds directly to your creditors. It usually takes 3-5 years to complete payments under a debt management program, after which you may be able to reestablish credit.