I have never done anything that big before, but I have heard that moose, like deer is pretty strait forward.
What do you want to do with the end product? That will dictate what tannin chemicals you need.
I will say this, I have dehaired some hides with the old ashes trick and although it works rather well, do yourself a favor and get a commercial dehairing solution. I wont dehair anything bigger than a squirrel with ashes anymore.
other than that I think it should be pretty easy, just alot of muscle work!!! If you have any more questions, I will do my best to help!