Nothing too complicated. Just follow the trail.
It’s still quite alpine, though, as you’ll be walking on scree all the way to Lac des Quirlies.
(S) From the Col de la Valette, take the path heading west towards the shepherd’s hut and reach the Valette torrent.
(1) Head south and climb briskly and rather ruggedly up the Crête des Sauvages (impressive but not particularly exposed) to reach the Fond de Ferrand plateau. Then descend 300 metres to the Pierre à l’Oiseau, a large erratic boulder.
(2) You’ll easily find a path heading north which, following the spillway more or less, leads to the Lac des Quirlies.
(3) Head back down the same route to the Pierre à l’Oiseau.
(2) Continue due south along the proper path which runs alongside the Ferrand on the right bank. Reach the junction with the path leading up towards the Col de Sarenne.
(4) Ignore this path and carry on straight ahead to reach the top of the Ferrand waterfall.
(5) Head down and then cross the torrent via the Pont du Ferrand. Walk past the hamlet of Le Perron at a distance to reach the Chalets des Prés further down.
(6) Continue downhill to reach theGR®54.
(7) Take this path straight ahead and you’ll easily reach the village of Clavans-le-Haut (E).