The most important thing to remember is that you need to show the whole staff ( Dietician,Pshyc,Nurses,Surgeon etc ) that you are committed to not just losing weight,but the fact you need to committed for a complete lifestyle change.
I can't so for sure what your team might say,My team didn't want me put on no more than a couple of pound so it may go against you.Sorry to sound harsh but more than ever,it's essential that you try and get to grip of lifestyle changes sooner rather than later...That way you'll be prepared for this Journey that is filled with high and lows...and if you follow the basics of WLS ...You'll get a lot of highs and believe you me,Nothing tastes as nice as looking in the Mirror and seeing the weight drop of.
I wish you well
Take Care
Andy