Start with easy boundaries and climb:
Level 1: Time Boundaries - "I stop responding to emails after 7 PM" - "I block 9-11 AM for focused work"
Level 2: Scope Boundaries - "That's outside my area of expertise" - "This needs to be a separate project"
Level 3: Value Boundaries - "I don't work for free/exposure" - "This doesn't align with my priorities"
Level 4: Relationship Boundaries - "I need to be spoken to professionally" - "This dynamic isn't working for me"
Level 5: Identity Boundaries - "That's not who I am" - "This compromises my values"