@MrsMorrisey I had this procedure the morning of my surgery.
it wasn’t too bad. In between the injection & scan I went & had a coffee ( was still time before my pre-op fasting as my surgery was late in the afternoon).
in the grand scheme of things it was one of the less scary procedures, much easier than a core biopsy (IMHO).
you’ll be fine - I asked many questions during & both the tech & doctor were very calm & made me feel comfortable.
best wishes for this & your surgery.
i too agree with @nicmaree - the support bras were good.
i wore mine for a good 5 weeks before I transitioned back to normal bras.
kelly