Gather the right equipment.
How to remove old attic isulation.
Use rakes to collect insulation on to dustpan place collected insulation into waste bag without commercial vacuum usage.
Use the 6 inch 150 foot flexible vacuum hose to draw the insulation from the attic into large bags for disposal.
Use the commercial vacuum hose to remove the insulation and clean the attic floor.
With these in place you ll be able to walk around the attic while removing the insulation.
If the attic is not large enough for a person to move around try tying a rope to the vacuum.
Place a large tarp wherever you plan to unload the filled garbage bags.
To maneuver around the attic safely lay large planks at least 6 inches wide across the joists.
There are several different types of insulation so you should first identify the type you have in your attic.
How to remove blown in insulation.
Rent a powerful hepa filter insulation removal vacuum from an equipment rental yard.
Use the shop vac to remove remaining insulation after raking and vacuum the attic floor without commercial vacuum usage.
Set up tarp and trashbags.