Anchor first and anchor high, you can always come down. Price each deliverable separately so cuts are easy: if they want a lower price, remove a deliverable or shorten usage, never just drop your rate for the same work. Lead with the value you drive, stay calm and be willing to walk. Caving once sets your rate forever with that brand.
How to hold your rate
Negotiation is about scope, not caving on price.
Anchor high first
Open with your real rate. You can always come down.
Trade scope, not price
Lower budget means fewer deliverables, not free work.
Be ready to walk
Walking away is the strongest position you have.