First I placed 2 flat steel bars under the hub flange beneath the lugs. The material I used was 3/4" wide X 1/4" thick by 4" long cold rolled flat steel. This was used to distribute the load over the backside of the hub. The steel flats will bend between the studs as the puller is tightened, but this is OK as it still helps prevent bending the hub. 

Snug the puller by hand as you place the steel bars on the back side of the puller. Once the puller is snug, tighten the 4 bolts which hold the puller's arms to the cross-piece.  This is important as it will prevent the puller from twisting off the hub. I tightened these bolts as tight as I possibly could.  To aid it removal, I oiled the threads of the puller and placed oil on the spindle/puller interface.

With the puller tight and snug to the hub, I tightened one of the pullers arms in my vise to hold it while turning  the bolt on the puller.  The whole axle shaft has been removed from the vehicle for U-joint replacement.

Wear Safety glasses and a face shield.

Tighten the puller bolt until the hub is released. It takes quite a bit of torque to turn the bolt.   The hub will "pop" off the spindle suddenly.