Yes your process sounds right, although I cannot say anything about the back up camera because I have never done one of those before. It cant be that hard though. Make sure to just remove the bezel around the headunit, you don't need to take out the full dash. Normally matching the wires is ca safe bet when connecting the headunit to the wiring harness, but I'd still look at a wiring diagram to make sure everything matches up correctly.
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