I've only been doing it for a week but I found that you have to keep busy doing things, and if you aren't then spend hours on minimins reading the success stories for motivation!
Other general tips: shakes are fabulous blended with ice and water, don't over heat the soups as they go all frothy and yukky, drink LOTS of water and using a straw makes it much easier. I also use an app on my phone to log all my water intake throughout the day as its easy to lose track. If you work then it might be handy to take a toothbrush in. Now I am in ketosis my mouth gets really horrible especially after a soup and I now brush my teeth three times a day as a minimum.
Finally just get through the first three days as they are the worst but it gets so much easier after that.
Good luck!