Park at the ski lift station to the west of Lac de Champex and take the ski lift.
Since this hike begins with a ski lift trip, don't use the function "Go to the starting point". It will guide you at the start of the pedestrian part of the hike and not at the car park of the lift station
(S/E) From the ski lift, take the well signposted path to the Orny and Trient mountain huts. The path is easy to follow, there are some easy sections with hand chains that may be useful when there is snow underfoot. In summer, you will not need the chains. You will come to a junction with another path on your right.
(1) This path leads up/down from/to Val d'Arpette, ignore it and continue along and steadily uphill to a second junction, this time on your left at the start of a flatter corrie.
(2) This second path leads up/down from/to Combe d'Orny, it is a nice way up from Champex if you want to miss out the ski lift. (See walk "Champex to Cabane d'Orny and return via La Breya summit and ski lift.") Ignore this path and continue over the corrie floor and then more steeply uphill through small boulders. At the top, you will have great views of the Petit Clocher du Portalet and come to a third junction, this time on the left.
(3) This path will take you down to Saleinaz in the Val Ferret, ignore the path and continue uphill on a moraine ridge to the Cabane d'Orny. Look out for the remains of the old Orny hut on the right just before a lake. (This section from the ski lift to the Orny hut is T2 see notes below)
(4) Walk in front of the hut and continue along the path. There may be patches of snow to cross and there is one section which requires the use of metal staples to ascend. Other sections have old climbing ropes fixed to use as handrails but depending on your skill level these may not be necessary. You will come to a signpost where there are good views of the Plateau de Trient. Continue up to the Trient hut in about 5 minutes. (This section between the Orny and Trient huts is more challenging than the first section,T3)
(5) From the Trient hut, take a track to the right of the hut and towards a metal rain gauge. (See photo) Continue along fainter tracks over the scree slanting up and right to the ridge and a small col. From the col, lookout for small cairns which mark the path through the scree and boulders below the ridge and to a col. (There is more than one track) From the col, clamber over boulders to the summit. Please note this section is not marked with paint flashes. You are negotiating a rocky, scree and boulder strewn slope; it will require some care and in a few places the use of your hands but it is not technically difficult. (T4 but not marked with paint flashes) In early season, the snow patch seen on the photo may lead to the col but you will need to be competent with an ice axe and use crampons if the snow is frozen.
(6) At the top enjoy the view and then retrace your path back to the ski lift (S/E).