The approach from Cabane De Mountet to the N-face is not that easy. It is pretty hard to find your track through the part of the glacier which is called "Le Coeur", because of the large number of crevasses. Start early. If this approach looks to hard, it is also possible to reach the N-face by climbing Wellenkuppe first and traverse to the N-face.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe