The walk starts opposite the Succoth car park on the A83, just west of Arrochar. The path climbs through forest before emerging onto open hillside. As you gain height, Loch Long opens out behind you; farther up, the views extend down the loch and across toward Ben Lomond when the weather is clear.
The approach follows the burn past a small hydro dam and the huge Narnain boulders. This is a good place to pause and look ahead: the three rocky tops have become much easier to make out. Keep a boulder or a stretch of the path in your photograph to show the scale of the peaks above it, without needing to stand near an edge.
Higher up, stone steps climb toward the ridge between the summits. The ground becomes steep and rocky, and the mountain feels very different from the forest path below. Keep enough energy for the descent as well as the climb. A shorter day can end on the approach, but you still have to walk back down everything you've climbed.