Moss is actually easy once you get the hang of it.
The important step is the initial rehydration. soak it in water until its WET WET WET. Sphagnum moss is hydrophilic, meaning it wants to absorb and hold water. The important thing is, once its been moistened, it needs to stay damp, because if it dries out, it becomes more hydrophobic and wants to shed water.
Soak it then pick up some and squeeze out the excess moisture with your hands. Kind of fluff it up, and put in in the container. Add the plant and pack moss treated in a similar manner loosely around the plant, but not so loose that it doesn;t make contact. I always use clear plastic cups to root in, because its easy to check the progress without pulling the plant out and see any problems as they occur, not when it is too late. Or, you can place the cutting onto the TOP of the moss with just the root in the moss, not the whole stem, and cover with a few strands of moss on top in a shallow dish container like a left over plastic that some produce comes in. You could do that with 1-2-and 3, $ I would put in a cup with more moss to encourage all these emerging roots to come on out. Of course you would put any of these containers on a saucer or tray. To add extra humidity you could use a pebble tray with water in it. Just don;t let the bottom holes of the containers sit IN water, the moss will wick it up.
The moss is also better to root in because the dampness produces more humidity around the plant that a soil mix would.
I use a hand held sprayer to water mine. When the top of the moss feels dry, I spray the cup from the top and let it trickle down. The excess drains out
