The wiring is easy if you use a wiring adapter. The wiring adapter connects color to color with the wires on the head unit then the whole thing just plugs into the factory harness. You don't have to worry about which wire goes where... just connect the red wire to red, the yellow wire to yellow, etc.
Your link doesn't work - it's probably a search you did which only works for that browser session. In any case, if the head unit supports wired remote control then you need a SWI-JACK for JVC, Alpine, Clarion, and Kenwood or a SWI-PS for Pioneer and Sony. This is all in a thread just a couple above yours titled "Steering Wheel Interface Question" (imagine that