The only thing I've got to add is something I came across when I fully rewiring a house to modern spec (fully signed off and legal with proper documentation). I don't live in the States so codes are different here obviously.
But the thing I want to point out, that was pointed out to me, and I've seen others' do badly is properly fixing wire into screw down connectors (like bus bars) especially in permanent installations. There is a proper technique for forming the wire, depending on it's size, big or small, multistrand or single strand. And there is almost an art to how much torque to put on the wire.
For example, a single strand cable (not used in RE here except in AC lighting circuits) can only be tightened down so much and then it will snap. It needs to be folded in half and fully inserted into the receptacle without any bare cable showing.
The biggest thing, from what I've seen and been told and seen.. and done, is that people do not screw down these points tight enough. This can obviously lead to arcing and fire.
Without wanting to sound like a spoilsport, a half an hour with Sparkie (electrician) mate and getting him to show you the proper way to do this is a worthwhile investment in beer in gratuity.
