Do you know if it will be mammo or MRI guided biopsy? I had 2 stereotactic mammo guided and 1 MRI guided. Literally, the only "pain" was just a super quick poke while deadening the area. After that, I could feel "pressure/tugging", but no discomfort.
For my mammo guided, I was laying face down on a special table that had a hole for your breast to be exposed form underneath. The mammo machine will then be used to hold your breast in place. (It was not quite as uncomfortable as a regular mammo). The nurse will go over whether a marker will be placed. It is very tiny, like a small seed. It will mark the area biopsied.
You will change in a gown. They helped me on and off the table. The tables was warm and cushioned, but still an odd position. My arm was above my head on the affected side and by my side on unaffected side. The nurse will hold and manuever your breast into the mammo machine. She will then wipe clean the area to be biopsied. The Dr then came in and gave me the injection to deaden the area. Literally a second of pain from that. Then Dr will begin biopsy. They will probably take several samples. You can hear noise from the instrument they use. Like I mentioned, you may feel tugging or sensations, but I had no pain. Once Dr was done, the nurse cleaned the area again and l turned me on my back. Heavy pressure was applied to the area to prevent bleeding and seroma (sp). I was given a small pillow to hold against my chest. I wore a tighter bra that day. Some wear a compression bra. I could have went to back to work after, but I had gotten myself into a panic worrying about it (ha!) so went home and returned to work the next day. I was sore for a few days. I wish you the best of luck!