annabody67 ... my experience was the same as Tri's .... A local anaesthetic with no pain or discomfort for the Sentinel Node biopsy. I had to massage the breast after the dye had been inserted ... to make sure it had spread to all the nodes in the area.
My surgery was the next day and I had an event free recovery.
Feel free to check out this thread as it has a lot of info on the Forum, with some handy links as well - what to take to hospital with you, etc.
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Take care and all the best xx