Hi 
As someone who’s just gone through the same op I’ll give you my experience.
I had my surgery on 18th July so am currently 2 wks 5 days post op.
I had single mx with immediate diep reconstruction, uplift and slight reduction to other side & lymph nodes were removed from my chest wall & armpit (my biopsy for sentinel L/N was positive hence the clearance)
I suffer with severe anxiety so wore a medical bracelet which meant I didn’t have to talk/engage if I felt anxious, but I could nod or shake my head or give the thumbs up 
if needed to alert the staff I understood.
I packed a small case and a small bag, and apart from toothbrush and toothpaste I used literally nothing apart from my iPad and phone.
I took an extension lead as I only needed to have that plugged in resting on my bed, and made it so much easier.
I also took a couple of my own pillows as hospitals never have enough.
Front fastening/buttoned pjs or nighties.
I’ve been told no bra for 4 weeks (other hospitals give diff advice)
I took snacks but couldn’t/didn’t eat them.
I couldn’t shower so just used appropriate wet wipes just to freshen up.
A neck fan was my saviour in hospital as they have to keep your body temp up.
At home I’m using sticks to aid with walking to take the pressure off my back.
I’ve borrowed a type of hostess trolly from a family member that has all my stuff on to make it easier, I’ve got my meds, tissues, snacks, creams, dressings, you name it, it’s beside me and within reach.
I have a long handed grabber too so I dont stretch. So if I drop things or need to reach a little I’ve have that, I also have a little bag hanging off the end for rubbish.
I’m recovering well and have had great support by my family.
I got the house in order b4 my op and I was in on the fri @6am and home Monday eve @7pm
I had 2 drains which were taken out on the Wednesday along with all my dressings and so far all is good.
Good luck hon with yr op x x x