You will be smiling all the way round
Only thing I remember (apart from hollering and whooping and smiling) was that the aircraft shot up after take off (due to half the people weight) but you already thought of that.
I'm sure you have been circuit bashing for the last weeks/months - and I expect the instructor has been keeping quiet during a lot of your ccts and landings, so its no different, except you get to do ot all on your own.
Don't worry - go enjoy - its the best experience, followed closely by your first solo land away, followed by passing the test