Hey there!
Good luck good luck good luck!!
My advice to you is ask as many questions as possible before the surgery......my husband had his surgery in Sydney in 2008, and we had a very helpful clinical nurse consultant attached to the surgical team who answered heaps of questions we had via email.
On the day, make the goodbyes quick, and keep yourself busy.....watching a DVD, reading, going to a gallery/museum....somewhere you can have your phone on, but will be distracted.
My husband's surgeon called me when he had finished the first part of the surgery, then again after they had sewn him up......he was on the table for 12 hours.
Be very aware of the confronting scene that will meet you when you are able to see your partner after the surgery.
I found ICU pretty full on by myself, with tubes coming out everywhere and his chest going up and down automatically as the ventilator breathed for him.....I'll never forget it.....
And over the few weeks post surgery, just be there....don't try and make small talk, take a book and read it, a newspaper was too loud for my husband to handle......just be there.
Good luck! It is called the "mother of all operations" for a reason.
Have a some support around for you too......
Take care!
PA