My main gripe about IT contractors, writers and other freelancers: they are just simply unbusinesslike. They are so rapt with the work and their "skillz" that they just don't bother with the boring "commercial" details. Later they will moan about what a crooked low-life Borque was.
So, Technique #0.0 - operate your business like a business, not like a hobby.
This means that you get it all in writing. What is "all"? YMMV, but rates, dates, names and numbers for a start. Payment terms, including 1099/W2 status. Jerry Erickson of Contract Employment Weekly recommended faxing a form letter spelling out the details as you understand them, and don't start packing until a properly executed form comes back. And no, I don't have the form letter any more.
Put on the green eyeshades. "C2H" good or bad? Bad usually, but might be right for you - if you can believe it. Promises? Must be bankable. In writing, by a person who can be held to them. The borque's receptionist probably can't deliver on any promises, except to have a drink with you and we'll see. Not bankable.
And then try to confirm any stories Borque may have told you with the client people you interview.
Many disreputable firms plaster the search engines with positive news, which pushes the bad news down the list. If you google, look at the very end of the hit list. And ask in places like this forum.