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Ignition switch will not disable horn or head lights so if those do not work then start with the battery cables: remove, clean, replace, and test operation. Follow the power back until you find the bad connection.
Automotive electronic are tiresome at best to diagnose. You do not need a Fluke multi-meter, but you will need at least one from Radio Shack to determine resistance, continuity, and to read voltage in circuits. A test probe (light bulb on a stick) and a 25 foot length of 12 gage wire with a batter clip on one end and an alligator clip on the other can make finding bad grounds easier as well as it allows you to bypass a rust car to see if a part is receiving voltage.