It's easy. All of the wiring is already there. You can get the foglights, the relay, and the turn-signal stalk with the fog lamp switch and it will all hook in just fine.
When they make cars, to save money and keep inventory low, they only make two harnesses. One for manuals, the other for automatics. Options don't matter, same harness.
I considered adding cruise control in my Matrix when I had it but always spent the money elsewhere. All I needed was the clutch cancel switch and the cruise stalk and I was golden. Wiring already there.