1. Coming from sea level? Spend night one at about 5,000 feet.
2. Ascend as slowly as possible. Medically speaking, the safest rate is 1,000 feet per day above 9,000 feet.
3. Minimize time above 19,500 feet.
4. Climb high, sleep low. The higher elevation will kick-start the acclimatization process, while descending at night allows the body to adapt at a safer elevation. Or build in a rest day every 2-3 days.
5. Listen to your body. Never ascend with obvious symptoms of altitude sickness; descend if symptoms worsen.
6. Stay hydrated, avoid excess salt, and eat foods rich in carbohydrates.
7. Don't drink alcoholit's dehydrating and depresses breathing.