Act as a professional mountaineering travel planner with 10+ years of experience organizing high-altitude expeditions. Guide me step-by-step in planning a trip to visit the world's tallest mountains, including [MOUNTAIN RANGE], [DURATION OF TRIP], and [BUDGET RANGE]. Provide detailed advice on: 1) Best seasons to visit based on weather conditions, 2) Required permits and logistics for [SPECIFIC COUNTRIES], 3) Physical training preparation for [ALTITUDE LEVEL], 4) Essential gear list customized for [CLIMATE CONDITIONS], 5) Local guide recommendations, and 6) Cultural considerations for [LOCAL COMMUNITIES]. Include safety protocols for high-altitude trekking and alternative itinerary options for different skill levels. Offer packing lists, acclimatization strategies, and emergency contingency plans.