The U.S. Embassy at Kingston, Jamaica has posted this very useful 54-slide PDF on how to fill out the DS-160 without tearing too much of your hair out.
"Effective immediately, all K visa applicants are required to complete the DS-160 Online Nonimmigrant Visa Application. The DS-160 replaces forms DS-156, DS-156K, and DS-230. For K visa cases already in process at a U.S. embassy or consulate, the...
"Effective immediately, the DS-160 Nonimmigrant Visa Electronic Application will replace the DS-156 Electronic Visa Application form (EVAF), the DS-156K (Nonimmigrant Fiance Visa Application), and the paper-based DS-230 Application for Immigrant...