Dig out a path 24-inches wide and 4-inches deep.
Spread a 3-inch layer of sand in the pathway.
Put 2 gallons of water in the wheelbarrow. Add the bag of ready-mix concrete. Add enough water so the cement is pourable but not soupy. Start with 3 gallons. The website Cement.org says to add no more than 6 gallons total for each bag. Exactly how much is dependent on how dry the air is and how much, if any, moisture the ready-mix cement has absorbed. Mix thoroughly with the spade.
Put the mold where you want the stepping stones.
Fill the mold with the mixed cement. Let it rest for five minutes. Then pull up the mold. The pavers will remain on the sand.
Repeat until the walkway is finished.
Spray the pavers with water to keep them moist. Cover with plastic to retain moisture for at least 24 hours.