Usually if it smells like shit, it is shit, so in my opinion, I would write this one down as experience. I know what you are getting into, you just don’t want this client to badmouth you all over town. That is the worst that comes from this. I have had instances in the very near present that occurs when nothing is signed, the clients don’t want to pay. Here in Australia, there are several free avenues I can take before I throw a court order at her, but at present a couple of clients are reluctant to pay, which I need to stamp down on immediately. In future, I won’t be doing anything until I get something in writing. No mun, no fun as they say.
So unless you have it in writing and you have some cash, forget about it.
If you can’t be good at it, then don’t do it.