Rental machine is for blown it.

Before you install insulation, you should also figure out your attic venting situation. Without proper venting condensation will build up and cause mold.

I just did blow in insulation at my house, around 900sqft worth of roof, because of the slope we couldn’t hit the same r value throughout, but used around 30 bails of cellulose insulation. Was around $600. Venting, installed by a roofer will be another $700.