(S) Park at the Church of Duingt, walk along the bike path to the little bridge just before the tunnel and follow the sign for Taillefer (on the left).
Take Chemin de Croix and then veer to the left (1) a few metres before arriving at the Notre Dame du Lac lookout point.
Then it'll just follow the path, passing by the marker at altitude 638, reaching the Cret du Bourg (2).
After the end of the Taillefer Ridge (3), continue towards the “Maisons" (the name signposted).
Once in the hamlet (4), take the "big" road and cross there to take the small road that runs along it.
Then follow the "big" road using various small shortcuts along it.
Arriving near Duingt, the signs for Taillefer resume and you just have to follow them back to the starting point.