Hi!
I'm a new yorkie owner too. I think it takes practice to be able to fix your baby up and get her used to it!
I got my baby at five months. You may have to start bathing your yorkie. Then as part of the weekly grooming process, you start putting a top knot in.
I'm certainly no expert. My top knots are rather clumsy and small. I do it, however, so that my Lucy gets used to me handling her. You need some very basic products and the right bands. Some people use the bands that are in braces.
There are all sorts of grooming tips here. You can find threads on everything from bathing to brushing to removing mats to cleaning ears and teeth and more!
You have to start doing it yourself though. Your baby won't remain all primped between grooming visits. And if you do it yourself, you'll require fewer trips to the groomer!
Good luck. Tracey