. Ask for More

Once the other person’s given a figure, even if it’s much better than you expected, say something like “I think you’ll have to do better that that.” Don’t be arrogant or aggressive. Just say it calmly.
When they inquire about your expectations, ask for more that you expect to get. Ask for more than you are willing to accept- you can always settle for less. Few people will walk away from a deal once it’s commenced, and you can let the other expectations” a bit at a time.