Day 3 is considered to be the most difficult day, because this is the moment when the cleansing hits it's peak. Most people who try a cleanse for the first time can experience nausia, hunger and fatique.
I personally have not yet felt this. Again this is mostly because i'm using the tips from the guide and have previous experience with this cleanse. However I am a little tired. I did have a minor headache the other night, but then drank plenty of water and it went away.
This is the most important day of the cleanse. If one passes this day, then he can consider the cleanse complete! Of course it's recommended that you keep doing it for at least another 4 days, but we'll see how it goes.
After day 3, the cleanse should become very easy to accomplish since it takes about 3 days for the toxins and other unhealthy substances to be purged from your body. While this is happening, you may experience the side effects, but it only proves the cleanse is working.
Anyway, onward I go!