It is all about PMA!!
The mind is a wonderful tool and you'll find once you get going Jac, the buzz you get from it keeps you going, and as you see the lbs just drop off, it urges you on even more.
As Mon said to me the first time i did it "food isnt going anywhere, it'll still be there at the end" .. its not like your giving food up forever, just remember that on the not so good days!!