The position the works best and is the most comfortable for me is to lie on my right side, with my head slightly elevated, and legs drawn up. I can usually fall aslep in this position. On the last flush is used a castor oil compress in the liver/gallbladder area and put a pillow and heating pad against the compress. You should have heard my gallbladder squirt! I will be flushing again this Friday and plan to use the compress and heating pad again.
Good luck on your flush. The most important thing is to do it as long as you need to, and to find out what works for you. I feel a little like an expert because I've done this 16 times; yet I also realize my methods may not work for everyone, but they are tried and proven.