The first step in negotiation is understanding the needs of your client. Since you’ll be working closely with a recruiter and they have a quota to fill, you can assure them that you’re serious about the offer by saying you’ll accept it right away if they can get you X. X can be anything that’s important to you and is not just restricted to salary.
Saying no can feel like placing an ultimatum. As we’ve talked about earlier, a negotiation is like a conversation (but with high stakes). If you’re getting close to what you hope you’re getting, you can say no in a non-confrontational way—“Thank you for showing flexibility on salary, this seems appropriate. Could we talk about other things that factor into compensation?”
Again, this will reinforce the image of your flexibility and allows you and the other party to examine compensation in a safe way.