I used the Mopar 21 circuit Painless kit. Painless it was not. However if you have a basic knowledge of automotive electronics, proper tools, factory wiring diagram, and patience, it’s not too terribly difficult. Personally, knowing what I know now, I probably could have used a lesser kit as didn’t use a lot of the accessories like the heat/ac, fuel pump etc. I agree with
@RustyRatRod that the wire gauge seems lacking especially for the charging circuit. I personally used a separate fuse/relay box for the higher amperage circuits like headlights using the Painless wiring to trigger my relays. Just my $.02
