Manifesting the will is fancy speak for spell casting
and I don't have any lengthy info on soul retrieval. It's a shamanic skill for healing emotional scars. When we get hurt or brutally used, we retreat and block off the part of the soul that hurts. We disassociate and fragment to survive. And we lose a part of our soul-self. A skilled healer can reunite the fragments and this brings healing thru natural functions. This is often depicted as descent into the lower realms where battle is made to retrieve and return with the fragmented parts. Can't think of any specific web sites, so just search "soul retrieval" & dive in.
I believe it involves untangling etheric threads around the person & then following the essential one's to the persona's fragmented parts.
I have personally received this healing and the reunion occurred spontaneously (actually when I was out for a walk in the park). While completely painless it was a bit like being pole axed. It resolved many hefty issues.
On a lighter note, as a preteen I had a flashing temper. One day I realized I didn't like how I felt when I was angry - sullen, bitter, hostile, but also powerful - so I decided to use the power to transform the feelings into good energy. I called it "trans-mogrify" from the Calvin and Hobbes cartoon. I would imagine my hurt or anger all in a bundle of spikes and snarled, rusty coils, held in my belly and command it to "transmogrify". It immediately melted into crystal clear water, and refreshment, cleansing me of all anger in the process. (I wondered why nations didn't do this).
So all these years later, today I was reading on the Trad Witch forum about Peruvian magic in the Andes mountains, where they
Ingest negative energies in their stomachs, just like digestion. They retain the nourishing good, and expel the crap into the Earth where it is absorbed and transformed to make good things grow.
Energy can't be created or destroyed, but it can be transmuted. If someone throws bad energy at me, i can "transmogrify!" and give me a blessing. Once the energy is in my ball park, it's mine to shape as I want. This is so much healthier than return-to-sender, where it can be sent back to me again and again. When energy is transmuted, the battle ends.