No special access issues
Park as for Bas cuvier ( or on the other side of the road at cuvier parking). Take the most south path (starts close to the motorway). This path will basically take you all the way. About 300m before the area you come to a crossroad, just continue straight. The main area has a visible path going to the left. For theorie there ain't really a real path but you will see the rocks on the right and there might be a small path going towards them. For the blue circuit area continue 100m more and you will have a clearly visible path on the left side.
Also possible to walk in from the main parking of apremont or from the southern parking of apremont, very similar approach times.