how to negotiate?

Answer 1

Be assertive.

List all of the positives & negatives of what you are evaluating, then assign your value to each. Don't let someone second-guess your list - it's your list, with your judgement as to what is important, not someone elses.

If things don't go your way, leave. If you feel pressured to make a decision, feel free to walk away and come back. Take time to think about it, and communicate that you'll need the time to choose.

Always be friendly. Always. ALWAYS.