The whole idea of this trip is to make you confident and comfortable with the equipment and mountaineering even if you’ve never summited a peak before. This isn’t an essential part of climbing Mont Blanc, but having really experienced guides by your side who allow you to prepare and get the feel of climbing in high altitudes is a major factor in actually summiting.
Starting from Chamonix or from Italy via the Skyway lift, you will do a glacier walk on Mer de Glace from France to Italy (or the opposite). There are no technical difficulties, the purpose of this is just to get used to the equipment and get a taste of a physical activity in altitude. Essentially, you will go into a crevasse and climb it—it will give you confidence with the crampons.
Activity: 4-6 hours