If you have a sense of unease, then maybe your gut is trying to tell you something.
How reliable is this person? How long is the work guaranteed for? What backing is there for the guarantee? Have you done due diligence on their business? What would happen if it doesn't work out? How does your work add value to their business? What happens after you sort out the current problems? or complete the scope of work?
Whatever you decide upon, make sure you document everything! The very act of minuting every decision, seems to improve the quality of decision making. Of course, you want to make sure there are unambiguous, signed-off specs for all work to be done.
How reliable is this person? How long is the work guaranteed for? What backing is there for the guarantee? Have you done due diligence on their business? What would happen if it doesn't work out? How does your work add value to their business? What happens after you sort out the current problems? or complete the scope of work?
Whatever you decide upon, make sure you document everything! The very act of minuting every decision, seems to improve the quality of decision making. Of course, you want to make sure there are unambiguous, signed-off specs for all work to be done.