2013 Bench Seat Swap for Dummies

Hello

I am new here and just bought my first Tacoma, 2013 Regular Cab. I have been reading a lot of posts here about swapping out bench seats, as most guys have said the driver's side is simple plug & play, the passenger lines up and bolts in no problem, it is the wiring that is the issue. I found this post that seems to be the most details and doesn't require ripping apart the bench to make it work.

https://www.tacomaworld.com/threads/2013-bench-to-2014-bucket-swap-help.729448/

does anyone have any insight into this of how it works and how to swap the wires? in it he is bringing in a dedicated 12V, wondering where this is coming from? i assume that for the most part, you are transferring wire for wire based on color? but what do you do with the extra 3 wires?

any insight would be helpful. thank you