Hi Bright eyes,
So glad to hear you are booked for surgery. I had it done in august of last year and it was a piece of cake, pardon the pun!! I had no difficulties whatsoever and I've been loosing steadily since then. I have not had a particularly fast weight loss, but I am happy with what's happening.
As to the waiting period, the number and type of health problems you have and things like your age are taken into account. From the time of my initial referral to the surgery date was about 3 years. Of course, I'm now a 'slighly senior citizen'

so I think that helped me.
Good luck and before you know it you will be joining us on the losers' bench.