I live in Vegas so I still think it's funny when people say they are coming to visit.
I don't think that is impossible, but don't count yourself as a failure or anything less than great if you don't make it entirely to goal. Mine is 90lbs gone by New Years but you know what, I will be MORE than happy to just have 70 gone, or even 50.
I am sure you can do it and so long as you give it your best shot you will be fine. We, of course, will be here rootin for ya!