It sounds like the deal has been made and it is too late to turn back. There are some things that you may need to prepare for. Some Yorkies do very well leaving at 6 weeks and some do not. They can easily go into hypoglycemia. If that happens, somebody may have to force feed the puppy every 1-3 hours even at night. It is never recommended that a Yorkie leave mom this early by reputable breeders (in the US, that would be those breeders who follow YTCA standards, and if they don't, they need to have a good reason not to).
If the parents didn't have health screenings done, the pup is at more of a risk for luxating patella (at least $1000 per knee if it requires surgery), liver shunt (one of the cheapest places in the US is over $1000 and then you have diagnostics before that), Legg Calve Perthes, etc.
You can do the Wisdom Panel to determine if this pup is full Yorkie but it isn't 100% accurate and after you get the pup, it may not be worth it.
All dogs, except for rescues, should have a health guarantee. It is something the breeders writes, not the new owner. It should be the breeder's idea to stand behind their puppies. $800 is a lot of money to spend on a dog whose parents haven't been health screened, that is only 6 weeks old and when there is a questionable pedigree situation.
Some breeders will ship their dogs, so they don't have to live within driving distance. Just another option.
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