I wouldn't do any of that, with or without someone's help.
This is more of a debt consolidation practice and not really a credit repair company. Although I agree with everyone on doing the work yourself, there are the cases (mine for example) where I just don't have the time to do this on my own. I am on the road a lot and when I am home I want to spend time with my family and not worry about all of the other things related with credit repair. I did my own repair for a few years in the beginning and it was very gratifying knowing I myself have done all that work. But now I have a different job and I focus more on work and family when I'm home.
I know that doing this yourself is the best way to do it and no one will do a better job than yourself...with that said I have used Lexington Law and wasn't impressed. I used another agency based in Miami (can't remember the name) and they did pretty good, but near the end slowed way down so I dropped them. Lastly I used a repair place my mortgage lady referred me to (Fair credit law) and they did a great job but has closed down earlier this year.
There are ones that are better than others and it's hard to find them, but if you have the time to do it on your own then by all means do it yourself.