There are ways a contractor can be of benefit to you. Sliding into the role of a Public Insurance Adjuster or even that of a Lawyer are not part of the program.
Facts are facts. So I am not going to give a big discertation here about the wrongful acts of contractors. But I am giving broad caution.
To that end, here is a link. This link is Texas specific. Check your own state as it may be the same or closely similar. Just take the information directly from TDI (Texas Department of Insurance). Follow the other links within that page. If you talk with 3 contractors, you will likely hear 3 different positions. Get the facts.