I just did my first flush after a year of indecision and learning. From what I read in Andreas Moritz Amazing Liver Flush book, the MOST important thing to do before and after you flush is colon cleanse. He says you need one kidney cleanse after each 3-4 liver flushes. You will probably get some parasites out with the liver flush, but I would do a parasite cleanse at some point if I were you. Humaworm is a great product.
Good luck! It's not as scary as it sounds and yes the stuff tastes terrible, but there are alot worse things that could happen from not flushing. You'll be fine. Be calm (stress constricts your organs), remember why you are doing this and you will be SO energized when you see the results!
Drink lots of water throughout the day. No water 20 minutes before or after the Epsom Salts , you'll dilute it. Remember NO fat the day of the flush. Fast from 1:30 on on flush day. Remember to Colon Cleanse again within 3 days of the flush to keep stones from getting stuck.