Yes, I had a lumpectomy, first at Providence, then a re-excision for clean margins at the U, with the SNB there too. It was done on an OP basis. My onc's nurse is Gini (short for Virginia), and I found early on that email use to communicate was a great way to go, especially for my surgeon when I did not know which procedure to do. I asked a ton of questions and got them answered when he was ready, and then I had a written document to study instead of relying on my handwritten notes. Yes, once they know the results of all the tests, they can tell you your stage.
As for genetic testing, please be sure to carefully consider the pros and cons. I asked about it, since I was 31 but had no family history. About 8 months after chemo, I went for the counseling, and then waited 6 months to do the testing. I needed to be sure I was prepared to handle a postitive or negative test result. Some people choose not to get testing...my opinion is if it will help you in some way, then go for it. If it helps to make a decision for surgery or chemo or future pregnancy, then do it. If you are not sure, you can always wait. I did the testing at the U too, Dr. Marajver was the onc, and Kara M was the counselor, who was wonderful.
I had asked about doing a mast or full node dissection if they found cancer while I was on the table...my surgeon said they would not do that, since it required different amounts of time in the OR, it had to be scheduled in advance.
My surgical nurse was Roxanne, but I did not see her much after I was cleared from surgery. I still see the onc nurse every time I see the onc, and she is my main person with whom I communicate.