The blown in insulation can be blown right over the ductwork.
Attic walkway over insulation.
Place a 2 inch by 3 inch board directly on top of the joist nearest to the edge of the attic with its largest.
If you can make the walkway 2 wide it most likely would not be necessary.
I would recommend fiberglass blown in insulation rather than cellulose because it is not conducive to insects.
You could also lightly spray for insects over fiberglass if needed.
Work from the perimeter of the attic toward the door or hatch so that you don t trample all over the insulation you just put in.
Exposed floor joists can cause condensation on the inside of the ceiling peeling paint and nail rusting.
The trail you leave in the attic can easily end up tracing a path on the ceiling below.
If you displace insulation in order to move around in the attic don t forget to put it back as you leave.