Where are the following literary techniques in this story: Metaphor, hyperbole, personification.

In a book this long, there are, of course, multiple
instances of all of this stuff.

You can find hyperbole on
the very first page of the book.  Sam is describing his tree and he says it "must be as
old as the mountain itself."  Of course, this cannot possibly be
true.

On the next page, there is personification when he
says that his tree is no longer "crying" as much as it once
was.

On page 7 (in my copy of the book) there is metaphor. 
Here, Sam says that the "curtain of blizzard" struck the mountains.  That is metaphor
because it is comparing the storm to a curtain.