Hey Nicky,
It all depends where you are having it done and what time as well.
What I did is pack my bag ready and asked my mum to bring on visiting hours as the hospital cant accept any loses if they lose anything.
I packed Pjs, toothbrush and paste, deodrant, mp3 player, slippers, some magazines. You wont need much the 1st day as you will be sleepy but i took just incase.
Hope this helps.