Hi Clare, people say it is best to do the full cleansing program before Liver Flushing but many of us (including me) have not and we have had successful flushes. So, if you're in a hurry (ie. in pain, GB pressure, etc) then do a flush as soon as you feel ready. If you're not in such a hurry and you really want to do the whole program - then great!
Don't worry about the enema - although they can be really beneficial. Just go ahead and do Hulda Clark 's Liver Flush as per her instructions.