Read the selling agent and the vendor the way a detective reads a room — from what they do, not what they claim. Profile each from observable behaviour, then get the blend play: how to handle and negotiate with their style.
A behavioural read for negotiation, not a clinical instrument — and a fast field estimate, not a validated assessment. Verify against the person in front of you, and keep every tactic truthful (NSW PSA Act s52 / ACL).