Very best wishes for your surgery. I found it pretty straightforward, very little discomfort and a quick recovery. The removal of lymph nodes can temporarily affect the mobility of the affected arm so be prepared for that - you will be given exercises to help. I found mine was very good, very fast, but it does vary a bit. Drains can be a bit tiresome, a bag (or deep dressing gown pockets!) are good to put them in so you don’t trip over them. They may be removed before you go home or not, depending on the flow of fluid. I found staff were almost over solicitous about pain relief, as I really didn’t have any, but that can be a good thing! Take whatever you enjoy to pass the time, front opening pyjamas are handy, and tea or coffee bags if you can’t stand hospital issue. My hospital provided me with a soft pad to wear (I wore my normal bra to surgery and back home but you may prefer a soft one for the duration) until I had a prosthesis fitted. Good to have the surgery over and done with.