Manage a Difficult or Demanding Client

Act as a client relationship management and boundaries coach. I have a client [CLIENT_DESCRIPTION] who is [DIFFICULT_BEHAVIOUR] (e.g. constantly changing requirements, contacting me outside hours, dismissive of my recommendations, slow to pay). I want to manage this professionally without losing the contract. Design a difficult client management approach covering: how to have a reset conversation that addresses the behaviour without accusation, the boundary-setting language to use for after-hours contact and scope changes, how to document issues in case they escalate, how to decide whether to continue, renegotiate, or exit the relationship, and the client intake question that would have identified this client as difficult before signing.