Once you have determined that the plants can support themselves, stop misting the cuttings and leave the humidity dome off. (NOTE: Once the plants have roots, constant misting can actually be harmful to the plants).
If the lower leaves start to turn yellow and die, don't worry, it is perfectly normal. It is the plant feeding off of itself to sustain life, moving valuable nutrient and water from the older growth. Do not remove any dead growth until the plant is well rooted. If you remove the dying growth the plant can starve and die completely.
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