Does anyone have any tips for negotiating salary for a new job? Basically I’ve been offered a job with a company that approached me because I have expetise they currently haven't got but the offer (about 8% more than now) isn’t as much as I had hoped (at least 20%). The role sounds interesting and will be a challenge to help them enter a new category but that brings it own risk especially as I would be leaving a secure job in a company that has been growing massively for 10 years.
I’ve no experience of negotiating salary; I have a feeling that they have chanced their arm with a low offer and expect me to negotiate. Do I just state what I want or go in way above that and expect to meet in the middle?
Sorry if this is a bit vague but I’d rather not give out specifics.

