You've already managed the screening interview and, perhaps, a second and even a third interview where the objective was to assess whether there was a match to the job. If both parties are satisfied, each will work to make the agreement and the relationship succeed.
Different people have different needs and place different weight or value on things.
There are always reasons to negotiate and advantages to be gained by both parties. Organize a main theme and identify key points. Concentrate on how your uniqueness will add value to the business, while contributing to controlling costs. Make the decision ahead of time whether to begin with a minor issue that will be easy to resolve or to present an issue of major importance to you. Take and present a long-term view.