Let them go another week or two, the. Roots wont get too big. Then dig around the plant to about 6 inches deep then lift the plant and roots out and set into a large pot, try not to expose the roots. Most plants don't like different soil than what there used to so it will get a little shock at first if your using new soil. After transplanted, water enough to run water out the bottom of the new pot and leave it alone for a week. It should perk up in a few days.