One small note to add to all these good answers: After you get all your gear, try all of it on at home. Get familiar with it. You don't want to go there and try it on for the first time, and then find out that you can't fit all your layers under your coat or in your boats, etc. The best time to find problems is before you go. Make sure you are familiar with all the pockets so you can easily take things in and out of them, and so you know their capacity. You want to know where to store things like sunglasses that you might take off and put back on, or something like where to store a small camera in your clothing.

One small note to add to all these good answers: After you get all your gear, try all of it on at home. Get familiar with it. You don't want to go there and try it on for the first time, and then find out that you can't fit all your layers under your coat or in your boats, etc. The best time to find problems is before you go. 

Make sure you are familiar with all the pockets so you can easily take things in and out of them, and so you know their capacity. You want to know where to store things like sunglasses that you might take off and put back on, or something like where to store a small camera in your clothing.