I'd say getting in shape, as you plan, is the biggest thing, both aerobic and anaerobic, but primarly aerobic.
Beyond that, people say that you ought to arrive in the locale at least 1-2 days early before exerting yourself in a long trek or hunt, just hanging out in a hotel or in your camp, in order to let your body acclimatize to the altitude. Then, just take it slow, don't overdo it, and stay hydrated while there! Lots of water. Lots of sleep/rest, too. Minimize alcohol intake too.
Start that exercizing now - get a stairclimber or treadmill so that you can exercise indoors during heat, cold, and inclement weather!
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