@EarlyForest -- There are a couple of different ways that a breast biopsy is done.
The most common type of biopsy is a fine-needle aspiration biopsy. When you go in for a fine-needle biopsy, you lay on a procedure table and the doctor inserts a thin biopsy needle attached to a syringe into the breast.
By using the syringe, the doctor can see if the mass is a liquid-filled cyst, or if it is a solid mass. This can help the doctor determine the course of treatment.
Other types of breast biopsies include stereotactic breast biopsies, in which a small incision is made into the breast and a tissue sample taken, and a surgical breast biopsy, during which a portion of the mass is surgically removed.
However, the fine-needle biopsy is most common for this type of procedure, so that's probably what you should expect.