Here's the deal:
1- the cancer has not spread into the lymph nodes (which means I have a good chance of only needing radiation, not chemo)
2- I do not have the genetic mutation for breast cancer (which means I don't have to worry about having my ovaries removed, or a prophylactic double mastectomy, or scaring my family about their own risks of future cancers)
I will have to have a bit more surgery. My surgeon said what she removed was too "close to the margins," and she will have to remove a bit more breast tissue to get "clean margins," but that will be an easier procedure, and she will go through the incision she already made. That will happen in early March.
All in all, things are looking up!