I to disagree with your breeder. As a breeder and someone who has also groomed my own pups myself for the past 12 years I can not stress how important it is to start the grooming process as soon as possible. Getting your pup use to being handled in the manner necessary to the grooming process take time and patience and the sooner you start the more accepting your baby will be of it. That includes the top knott.
I start by using a cat brush that is very soft no poking or prodding type tools. This will allow you to get your baby use to being touched with odd type things and to not be scared of them. Than move onto more grooming type tools that would be used for grooming. Also I suggest that you start clipping the nails at a young age also. Be sure to research the proper way or ask your vet. You can find tips on grooming your baby on my site:
www.dawnsyorkies.weebly.com/grooming-tips