Never used a First Cut thing-a-ma-bob...but I've killed a bunch of critters with Zwickeys.

Get yourself a 10" or 12" mill bastard file, a fine Arkansas stone, and some honing oil.

Lay the file flat on a table with the handle tang pointed straight back towards you. With a mounted broadhead, drag one edge at a time from back to front on the file. Keep doing this until ALL of the factory grind marks are gone and you roll a burr on the edge. Flip and repeat. Do the other blade.

Switch to the stone and do the same untill you roll a burr. Flip and repeat. Do the other edge. Remove the burr completely with a VERY LIGHT pass on the stone.

To finish it off I take the stone and round over the tip of the head. Don't blunt the thing, just make the tip not so "needle-like". It increases it's strength and greatly reduces roll-overs.

JRW