I would also suggest the most important thing is time.I have seen too many guys plan a 6day hunt only to get weathered out for 2 and only have 4days to hunt.I am a Alaska resident and take 2 full weeks I do not stress if the weather goes bad or the caribou are not moving I have sat in spots for 5-6 days and have not seen a thing then bang they are all over the place stay patient stay off the sat phone hunt every day enjoy yourself.Just starting my research into planning a Caribou DIY Fly in Hunt. Anyone have any advice or forums to point me to as to choosing an air service or region to hunt out of?