Ok. This was a pretty difficult song to tab, so bear with me, as I'm going to have
to make up names for most of the chords lol. I tabbed the main guitar, and it's CAPO 2.

Here is my list of chords so I don't have to really tab it.

A=  E-0         Ga= E-x      Dis (xx0232@1)normal    D#b= E-2    F#b= E-4-|
    B-2             B-2                          B-4         B-3-|
    G-2             G-2                          G-x         G-4-|
    D-2             D-0                          D-1         D-2-|
    A-0             A-x                          A-x         A-x
    E-x             E-3                          E-x         E-x


D#= E-4        D7?= E-1
    B-5             B-3
    G-6             G-2
    D-6             D-0
    A-4             A-x
    E-x             E-x


Intro=  A, Ga, D, D#b, F#b

A (x02220@1)                                         D (xx0232@1)          F#b
I should have held your mitten when we were, out in the snow,
       D (xx0232@1)             D#b                      F#b
we were, out in the snow, but I was playin it cool.
A (x02220@1)                              D (xx0232@1)   F#b           D (xx0232@1)   D#b
I should have took you under the mistletoe, under the mistletoe,
              F#b
oh I'm such a fool.


D# (x43121@3)                    D (xx0232@1)                   A (x02220@1)           Ga       DAnd (xx0232@1)the only thing I want for Christmas, is a mistletoe and you, oooo oo.
D# (x43121@3)                  D (xx0232@1)                             A (x02220@1)              Ga
And the only thing I want for Christmas, is something I will never have,
       D (xx0232@1)     D7?
oooo  oo


The other verse and chorus are the same. And here's the little picky part. Just hold 
F#b and it's pretty easy.


e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|-------2-------------------------------------------------------------------|
D|---2h4---4-2---2-----------------------------------------------------------|
A|-------------4---0---------------------------------------------------------|
E|---------------------------------------------------------------------------|

There you go. Sorry about how confusing it may be, but I'm sure no one else would 
have ever tabbed this.