Break up polystyrene packaging that bedding plants are sold in to form a layer of crocks at the bottom of the pot. Polystyrene is light, easily broken, and can be used instead of terra-cotta. Add some multipurpose potting mix.
Position the plant to check that it will be planted at the same depth as in its original container. Water it, and then remove it from its pot. If it is root-bound, tease out the roots to encourage it to establish.
Position the herb in the pot. Fill in with soil around the plant and firm it in. Water the pot well and cover the soil surface with small slate chips. These act as a good water conserver and decorative feature.