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How do I remove old mineral wool on an attic roof?

We recently bought a house and are in the process of renovating.

The intermediate slab from the upper floor to the attic (currently not insulated at all) needs to have the insulation renewed.

The structure from below is as follows:Sheetrock/ Blue foil (vapor barrier)/ Mineral wool (destroyed and not airtight -> replacement)/ Particleboard.

Now we want to remove the chipboard on top, take out the old mineral wool, install new mineral wool and lay the boards on top with a spacing of about 1-2 cm.

In addition, the attic should be insulated between the rafters (-> mineral wool and just sheetrock in front of it). We were advised not to use vapor barrier to insulate between the rafters, or it was not considered necessary, as it will not be 100% waterproof afterwards anyway, and air circulation should be guaranteed in the old house anyway.

So far so good, but I have two big questions:

— What is the best way to remove the old mineral wool and get it out of the house?

There is only a mini-window in the attic, large bags of mineral wool won't fit in there.

Should I pack the absorbent cotton as tightly as possible in the blue bags on top of the attic and then move it through the house to the outside (or through the first floor window)?

I don't want to spread fiber all over the house, but I don't know how to get around that problem. Or am I being too fussy?

— Is this procedure normal? According to the roofer, it can be done the way we planned.

• attic