I did it for Moose/Caribou back in the 90's. Buddy and me flew into the Mulchatna River area with 4WAir. http://www.alaska.net/~fourwair/
I shot my caribou on the first day. He had everything I wanted in a bull, and I knew that if he walked past me, I would never see him again. That was a smart decision because the next day, we only saw a few caribou and then we didn't see any after that.
We where caped next to a pond out in the tundra. The tundra is a sponge with massive holes in it. When you walk across it, you are in a few inches of water, or you step into a hole and fall down. This became very painful and difficult after the first day's excitement wore off. The mosquitoes, or no se ums, where even worse. Fortunately we bought head masks for the hunt. There was a cloud of mosquitos around your head all day long. When you took it off to eat or drink, they attacked you. We used 100% deet, and that helped, but where it came off from wearing a hat, the mosquitoes attacked over and over again. It got so bad that a few times I just wanted to runaway from them!!!!
You have to have the very best rain gear and hip boots. Make sure you wear you hip boots before going there, you will be in them every day, all day long. It rains every day, several times a day. It's cold, wet and miserable. You are limited in how much gear you can bring in because the planes are so small. You fly in one at a time, and then your gear comes after you are on the ground. There is nothing like the feeling when the plane takes off to get your buddy and you are out there all by yourself.
I'm indifferent on recommending him. He didn't do anything wrong, or mislead us, but he did promise us to relocate us once if we didn't see any animals in our area, and our pilot told us that when he flew over our area and didn't see anything, the outfitter didn't want to move us. He kind of made a big deal out of it and we where moved the second to last day there, which gave us one day to hunt in the other area. The other area had some really nice moose, but we lost them when we dropped off of the ridge and got into the timber.
I've been to Alaska 3 times. That first time for Caribou and Moose. Another time for just Moose without getting one, and a third time for Dall Sheep, where I got a decent ram. I still want to go back for a moose, but it seems to be one of those things that I start to plan on going, and then something comes up. The price has become so expensive that DIY is my only option if I go again.
It is the most miserable, painful place that I've ever been. It's also the place that you can't wait to go back after you've been there.