Say it straight or don't say it at all.
Verbal deals are not deals. They are intentions. Time and memory turn intentions into disputes. Write it down every time, with everyone, no exceptions.
References are free due diligence and most people never use them. When you do call them, the right questions tell you almost everything you need to know before you sign.
Most business owners hire a web developer based on portfolio aesthetics and price. Neither of those tells you whether the site will actually work. Here is what to actually check.