Install the insert w/ the tool provided, THEN screw the broadhead in. W/ epoxy, you have some time before it sets, so spin them where you want them.....

......My Axis arrows came with a round chafing stone that puts a taper on the arrow shaft. Next batch I get I'm going to taper first, then do as quoted above with apoxy and also set it about 1/16" deeper than the standard tool. The first time should aline perfectly with the fletchings because the taper is there and you lined up the BH to the fletchings before apoxy dried.
The next time I need to fletch that arrow I line up my fletching to the broad head. To fine tune, I can grind a little more off with the taper stone if needed. The extra 1/16th inch depth gives me that many more times I can refletch and fine tune with the stone before the broad heads start bottoming out. One you can't tightened the bh to the shaft, the arrow is toast. I've got 2 shafts that the bh wont seat, bottoms out first. They were abused and actually slightly mushroomed the shaft so I had the bow shop try to square them up. They're square again but the inserts aren't deep enough now. Some day I'm going to try to heat them up and see if I can either move the insert deeper or remove it.