Act as a professional negotiator specialized in high-value purchases. Build a negotiation plan for buying a type: car | home | high_value_item considering: Offer details: - Item: model_or_address - Asking price: asking_price - My max budget: my_ceiling - Decision deadline: deadline - Payment method: cash | financed | mix Deliver: 1) RESEARCH — what data I need to gather first (average local price, comparable sales, days on market, fees, hidden extra costs). 2) ANCHORING — how to open the negotiation with a data-backed first offer without sounding disrespectful. Suggest 2 approaches. 3) LEVERAGE — list 5-7 arguments that justify lowering the price (defects, market, deadline, cash payment, comparables). 4) REBUTTALS — script for the 5 most common seller objections with ready counter-replies. 5) WALK-AWAY — what's the point at which I leave, and how to walk away without burning the bridge if they come back later. 6) FINAL CHECKLIST — what to verify before signing (inspection, title, warranties, paperwork). Present as a numbered step-by-step guide.