The tricky bit isn’t what goes where but running it cleanly and neatly I suggest getting to grips with how to gauge, strip, crimp, solder, heat shrink the different types of connectors. How to use a multimeter, test a circuit and seal a joint...
Rig it all up at home on a battery and test it, then make up a loom test fit the loom then once happy install it.
Or just start and hope which is what most people do.......
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