Adam, one of the gardeners in the Idea Garden whose domain includes the cozy greenhouse, had all the supplies laid out and ready to go: cell packs, seedlings, labels, flats, etc.
Seeds are sown in trays and labeled with the plant name, sow date, location in the garden where the plants will be used, and the number of transplants needed. When the seedlings are transplanted into cell packs, the label is copied and a new label placed in each transplanted flat.
The next step is to turn out the seedlings and gently tease them apart. The cell packs are filled with moist planting mix and lightly pressed - careful not to compact too much, but not left too fluffy or the soil will wash out when the plants are watered in. You also want good root-soil contact so the new roots will take in much needed water and nutrients without crushing them.