I've had a long journey of healing with Rhiannon, even though it's not what She is known for through Her mythology. This is a personal story, admittedly full of subjectivity, but I want to share it, so here we go.
I had been consciously honouring Epona for some years when I began praying to Rhiannon at the suggestion of a friend. This friend is a Shaman, or neo-Shaman, if you will. (Yes, I know all the arguments about the use of that word, as well as the full discussion about first world people attempting to do this work.) Whatever we call my friend, I respect him and the work he does enough to have paid attention to this, even though he was talking about things that at the time had no real meaning for me.
Great and Blessed Rhiannon, Mother of Horses, Queen of the Land, Queen of the Starry Fillies, Great Mare of Sovereignty
Teach me to stand firm on the earth
and to love and honour your body
Teach me to know my will
and to feel the pleasure of life
Teach me to wield my power
to wield it from the belly
Teach me to love your children
and all who share our world
Teach me to speak the truth
with honesty and compassion
Teach me to see the truth
seeing both far and deep
Teach me to commune with you
make me worthy of that honour
Then last spring I got a drum, and began using it at my full moon rituals. That is blossoming into something very special, and I believe very healing for me, in which I find myself singing and sometimes dancing. In September, something new happened, and I was shown how to drum the chakras, which I believe is a much more vibrant and effective approach for me, and sometimes leads on to other bits and pieces of self-healing. Sometimes I also hear the voice of Macha and Epona joining in, encouraging me to heal myself. That is something I have been needing to hear.
As with any ritual, saying this prayer is more effective if I put energy and intent into it. I am prone to lapse on anything like this. I call it my "daily practice" - well, it is when I'm doing it! However, every day that I do it adds up to a bit of strength and depth that helps carry me through the lapses. And if I'm a bit short on energy and intent? I think it helps keep the pilot light lit. There is a spark of energy and intent even when I mumble the words with my mind half on other things. It is easier, by far, to light the furnace when the pilot light is working, just as it is easier to build a fire from a live spark than it is to begin by rubbing a couple of damp sticks together.
The other day I was meditating, and I wondered about Rhiannon's healing connection, and I heard Her speaking to me. "I am not as different from Bride as you might think. After all, I love the land and the little healing springs." In my mind's eye I saw the muzzle of a white horse, drinking from the smallest of springs.