Thanks Gonzo. Any tips? Apparently the Nokon instructions are poor. I'm planning to keep the existing brake cables and just Nokon the shifting.
Measure twice cut once with the liner cable.
Be prepared to thread and un-thread the pieces repeatadely; it takes a while to get all the bits the right length.
Tape the cables to the bar where they go under the bar tape.
Leave sufficient cable in the thumb loop that you can pull the brake levers through a lot of their rotation; once the brake blocks wear down, you can find that the brakes lever movement is restrained by the gear cable of the thumb loop if it's too short.
If you're using standard (black) brake cables, you might want to use the black nokons as they're more durable.
Most importantly, leave yourself a lot of time so you don't rush it. Rush it and things will go wrong.