I find this staircase true luxury. Well, a spiral staircase as a construction staircase does look a bit unusual, but it seems to be common. I'll say: one should be able to adapt oneself to temporarily unfamiliar situations. Others can do it after all. If I don't like it or can't do it, the problem is mine, not others'.
P. S. We had nothing like that, just a ladder. And if the drywall installers can get their boards up there, the plumber the bathtub, I should be able to trust the ladder as well.
It'll be fine – just have courage!