Well.... Experienced electricians use a variety of techniques to fish walls, but it's really hard to detail them all through text. You could watch some YouTube videos to get an idea.
But the most beginner friendly way is probably just cutting holes and patching them.
I'm building the house currently. Installed the panels on the roof yesterday. I'm not getting an electrician. All of my walls are open. I'm speaking of the 6-10 wires that will be coming out of the bottom of the unit.. how did you all clean that up?
I would just get a threaded 90degree conduit elbow of the size of the outlet hole, and make a direct run directly into the wall behind the unit. Once it's in the wall, it's out of sight. No bare, visual wires.
