Hi all,
Let me preface this by saying that I am still a student of Taoism and am certainly NOT a master by any stretch. This is only my experience and what has worked for me. I do the MCO taught by Master Chunyu Li in Spring Forest Qigong. At first, I found it difficult to move the energy because I was concentrating on moving it too much. Before doing the MCO, I am careful to harmonize my energy and also to make sure the channels in my back are open. Since doing these two things, the waterwheel moves very easily and I have energy continuously going up my back and down by front into my lower dantien simultaneously with each inhale and exhale. I have noticed that my lower dantien gets very warm when I do this. Last night I did something that I usually don't do with the MCO which was call upon my master to guide me through my evening meditation--I ended my MCO meditation early last night because my lower dantien was becoming uncomfortably hot. I took this as a sign that I was doing something right--hopefully that is true. I was careful to ground and harmonize my energy after stopping the MCO and thanked my master for the guidance.
Again, this is my own humble experience. I am interested to hear other points of view on the MCO, and of course I wish you well on your own journey.
All the best,
Birch Tree