there's no sense paying someone for something you can do yourself faster, cheaper, and better.
there are some great websites out there that will give you advice and steer you in the right direction...
as for removing negative information, sure it can be done...FCRA states that items must be accurate, complete, and verifiable...if the items fail any one of those, they must be deleted (of course, many times the CRAs aren't too intereseted in following the law, netiher are collection agencies, but you can deal with that too.)
the best site for information is creditboards.com