I find day 3-4 to be the hardest, It's best to keep yourself occupied.
I'm fine whilst I'm at work but its in the evenings I struggle, To help this I hold off having my breakfast meal until Around 12pm and then have my Lunch meal around 5pm so that way I have another meal to look forward to in the evening!
Good luck its totally worth it when you step on the scales at the end of your first week as most people do have a big loss on their first week!!
x