Did you know that the YTCA (Yorkshire Terrier Club of America) requires Yorkie breeders to keep puppies until they are at least 12 weeks old? If your puppy comes home at 6 or 8 weeks she will miss many important lessons in socialization that I promise you will regret later. Just do a search for "biting" or "bite inhibition" and you will pull up tons of threads from owners trying to teach their puppy not to bite them because they were not taught by their mom and littermates.
I would really, really urge you to read the thread Beamer's Mom posted a link to:
http://www.yorkietalk.com/forums/yor...ead-first.html