thank goodness you didn't buy used!  a lot of ugg wearers go barefoot because they're so hot, major yuk!  the ones you got are cute!!!  you will be stylin' and warm.  as far as hats go, i only wear them in -20 which i doubt you will have.  and if you are skiing, opt for a helmet instead of a hat!  take two scarves, you can always wrap one over your head if you need to, or better yet find a cute 'touque' when you are there.  know you'll have a blast!