Left from the Refuge de la Lavey around 4am, up to Glacier du Lac (around 1h30), then crampons on and onward to the couloir where you reach the foot of the Aiguille.
Then it's a small easy climb where you don't really need to rope up except for the last few meters.
All in all takes between 3 and 5 hours to go up depending on the snow conditions and your stamina/skills.
We did all the way down sliding down, much funnier and faster!