During a lumpectomy, your surgeon makes an incision large enough to remove the tumor and a margin of healthy tissue surrounding the tumor. The rest of your breast remains intact.
A lumpectomy is usually performed using general anesthesia, which will make you unaware during the procedure.
Your surgeon will make an incision over the tumor or over the area that contains the wire, remove the tumor and some surrounding tissue, and send it to the lab for analysis. He or she will do the same for the sentinel lymph node or nodes if you're having a sentinel node biopsy or the axillary lymph nodes if you're having an axillary node dissection.
The surgeon will then close the incisions with attention to preserving the appearance of your breast, using stitches (sutures) that will either dissolve on their own or be removed later by your doctor.