74 Dart possessed by Satan...

There are 2 wires that feed ignition/spark. One is hot in the switch start position, the other hot in switch run position. Sounds like that's where your problem is.
Replacing the ignition switch isn't hard labor. It's just a matter of having all the right tools and instructions.
Garage labor rate is the same whether the tech is bent over under the hood or sitting in the drivers seat. I personally would rather change your ignition switch than to change your oil. LOL