Being scared is not a good feeling... I'm just wondering: what are you scared of? Get ready for some funny tasting stuff you'll have to drink but rather than that - nothing to be worried about. Look at the pictures, what kind of results other people had. Nothing is scarier than knowing that kind of stuff is inside of almost everyone's liver, including yours... :)
Make sure you keep the rules, follow the instructions closely and stay positive about the upcoming experience.
Good luck and please let us know how did it go. :)