I feel for you, I groomed Joey the first few years because I was very fussy, I just think that the hair around the face can change their looks so much that they look like a different dog. I decided to get Joey a special cut a few years ago and was able to go to his breeder and I've never looked back, she’s groomed him ever since. It's so wonderful leaving him there and knowing that when I pick him up, he's going to look like a million dollars. (I wish she could do my hair!) If I were you, I’d cut out pictures of cuts I like, and especially facial cuts and show it to the groomer. Make notes on the picture too so that she won't have an excuse for not remembering something. Take a picture of him now, and take a picture of him as it grows out when you start to like it more. You just need to be able to communicate what you like to her and if she still can’t do it, find a place that can.
The equipment you need depends on what type of hair cut you like. YTCA has a grooming page, that's pretty informative and has some tips. The body is a modified schnauzer, but the face isn't schnauzer like at all.
Yorkshire Terrier Club of America Grooming