Hi Emma,
Thats the same open surgery as I had, and being 36, I got to keep my ovaries too. The best things i bought in prep for my surgery, in no particular order:
Big knickers, the belly button warming 100% cotton type, in the next size up. Pack of 5 from m&s (I actually got 2 packs as these were the only pants I could wear for a few weeks)
Long t-shirt nightie and loose maxi dress, comfy wire free bra
A long charger cable for your phone in case the plug is in an awkward spot in hospital or in your resting nest when you get home
Cushtie microbead cushion off amazon (to hold against your tummy when walking, laughing, coughing, sneezing, getting out of a chair)
Lactulose (you may be on opioid pain relief and you do not want to get constipated)
Nice lip balm & nice hand cream
Water bottle u can sip from (no spill type)
A largish make up bag to hold all my necessities in so I could easily transport all my stuff from one resting place to the next (tablets, lipbalm, phone, headphones, wipes, etc)
paracetamol and ibuprofen as the hospital sent me home with only enough for about 3 days. They also only gave me only 2 pairs of TED stocking which I had to wear every day for 28 days, so once I got home I ordered more in my size off ebay
There is an ebook called SMILE by Caroline Williams which I downloaded on kindle and it is a good read of her account of the surgery and recovery and pretty much consistent with my own experience.
Headspace app subscription- free trial is often available!
Seems like a lot but probably you already have half of these items at home already!
Hope this helps with the practical side of things,
Xxx