I haven't used one, but I do know that some are good and some are scams.
One suggestion, call the county welfare services in your area and see if they have a recommendation.
My sister paid a lot of money to one debt consolidator and then found out from another that she really needed to file bankruptcy - money down the drain.
Another option is that some women's shelters and churches offer financial counseling - those folks would also know the best people for this work. There are some non-profit organizations that not only help with debt consolidation, but also financial counseling, etc. for free.
Good luck