Good luck! Makes me kind of jealous and wishing I could go through the donation process all over again! Take a notebook with you and jot down thoughts, a timeline of the surgery, etc. You might want to get a friend or family member to keep track of the times when different things occurred. My sister did that-she kept a timeline of when each update was made while I was in surgery, what was being done at that time, etc. The last time she listed was when I was moved into my room. It was cool to have later on to reconstruct the timeline so that I could remember what happened. I also took a disposable camera and gave it to someone on the surgical staff to take pictures for me. I really enjoy having them as well.
Praying for complete success for you and your friend!