The Liver Flush is awesome. I look forward to it so much now, yet only 3 months ago I was afraid of it too. It's just the fear of the unknown, but you'll see once you try it that it's relatively easy, and somewhat enjoyable - really! There may be some slight nausea, as the others have said (I've done 6 flushes and have never felt nausea).
I'm doing a spur of the moment flush tonight - I woke up today and just never felt like eating, so I didn't. Around 2 in the afternoon I realized that it was the perfect opportunity for a liver flush, so here I go with #7!