I was also really worried the days leading up to op, but it turns out I really had nothing to worry about. Personally i tried to relax and much as possible, I found that listening to chillout music and breathing exercises helped. I brought my ipod in, and was listening to that non stop leading up to the admission time and while I was waiting for my op.
A couple of my friends was telling me it really wasnt painful post op, I didnt believe them, I was thinking – its cosmetic surgery so surely it will be dead painful!?? I was wrong!!!! So yes, it was a little uncomfortable at times, but on a serious note – I didnt feel the need for painkillers after op, I only took it to prevent pain. (Came around from op at 1.15pm – first painkillers taken at 6.30pm)
Dont fret or worry too much, try and keep your mind busy with other things for the next week(easier said than done i know!). On the day of the op, relax as much as possible and think you will soon have new lovely boobies, you will be having 2 early easteregg surprises when you wake up from GA:)
Good luck – look forward to see the result 
xxx