Thanks hun!
I was as excited/nervous as you before I started - but absolutely promised myself to stick to it absolutely religiously for the first week come hell or high water! I did and lost 11 lbs that first week which encouraged me to carry on to Week 2 .. and so on.
It's strange to begin with and obviously you feel a bit hungry and might get a bit headachey or light-headed for a few days, but as long as you drink as much water as you can (I did 4 litres a day - every day) then you'll be fine
Just keep reminding yourself that "Nothing tastes as good as being slim feels"
Good luck!