there is a counter nut that fixes the knob, so you will need a 12mm spanner to loosen the nut (and please take the nut with you too).
Lines: yes, all three start at the 3way connector. Removing 2 of them is an easy job, but the third one goes below the radiator and ends below the battery,
so it will be no easy job to remove it. So don't spend time with it.
And I need good looking lines, so if the surface is rusted or heavily weathered just leave them there.