Going up or going down that looks tough and dangerous.
I’ve climbed up and down Half Dome multiple times using these cables. Easy peasy and done thousands of times per year by all sorts of people young and old. Not dangerous at all. The advice I would give would be to have shoes with good traction and a pair of sturdy gloves. There is usually a pile of gloves at the bottom of the cables but there are typically pretty torn up. Great view of the Valley from the top and well worth the climb.