Start with clean 4-inch pots and pre-moistened, high-quality potting mix.
Water your seedlings to loosen up the potting mix and keep the roots moist while you work.
Always handle tomato seedlings by their leaves, not their delicate stems.
Position the tomato seedling in the center of the pot so that the lowest set of leaves is even with the rim of the pot.
Repeat Steps 1 through 4 for the remaining seedlings.