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The N 135 is the same road you are walking parallel to out of Viskarret/Guerendiain, so you don't need to go in to Linzoain to find it. Make sure you are highly visible if you take the road.At Linzoain you can pick up the road N 135 and follow it down to Zubiri. Walk on the left side verges of the road.
I would definitely Second this advice.....The Steep and rocky section needs your full attention.The first two km to Linzoain might be fine, but I would not do after that in the dark. It's in a forest and the descent to Zubiri is dangerous enough in daylight. It's rocky, leaf covered and slippery.
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