I have a 1980 Ford Mustang 4cylinder
My headlights don't work I believe the problem is either in the switch, the wiring harness or maybe even the circuit breaker stuck open.

Can anyone tell me where the circuit breaker on the light switch is located??

Is this something that I can fix myself? Or should I get a professional to do it?

 

Welcome to the site, where about's in Canada are you ? I'm no expert, but I don't think there's any circuit breakers in your car. Fuse maybe, but no breakers. Whether you do it yourself or take it to a shop depends on how mechanically inclined you are, and how much patience you have for chasing electrical gremlins. Good luck !

 

Hi looking at the diagram, for your model, there is a fuse link (bulk/orn) hot at all times and there are 2 other fuses F-4 and F-7 both 15 amps. I've got a picture of the diagram but I have no clue how to add it to my Reply.