great stuff from ozarkflyflinger with very little to add. i can’t explain why but having the pliers inline with the hook point gives better results with fewer breaks of the barb and a smoother contact between the tip of the barb and the shank.
don’t forget the small pliers-small hook / big pliers-big hook ‘rule’ or you’ll either damage your pliers and/or get mediocre results. one last thing, be sure to apply smooth pressure and not some hard and quick squeeze.
personally, i only tie with factory barbless hooks because the hook design is almost always better at holding fish on than with ‘standard’ designed hooks with crushed barbs but this trick is always good to use when friends give me flies. enjoy !