One thing that you need to consider when dubbing; make sure that the moon is in the right phase. Most "old-timers" swear by it. And If you ever read anything about the moon phases, nearing the full moon makes the blood run "higher" in most all species. Any one who works at an institution for mentally disturbed can tell you that. Also, after several bouts with helping dub cockerals, and then castrating bull calves, even the most skeptic will prefer to wait until the moon is in the last-quarter to the new moon (dark). An old-time remedy is to use cobwebs to stop the bleeding but ...... We do not even "band" our bull calves unless the moon is in the right phase anymore. I am not so well versed to do everything by the moon, like planting all things in the garden, but with the dubbing and castrating it definitely does make a difference.
Find someone at a purebred poultry show who raises O.E. or Modern Games, and get some help. Most fanciers will help "newbies" if you are respectful and genuinely interested in learning. Doesn't mean you have to raise show birds; but the fanciers are the ones who have kept the genetic pool of breeds/color patterns alive by their dedication.
One of the reasons that the game breeds are dubbed is because they were originally bred for "gaming" (fighting) and the roosters can't grab the comb or wattles if they have been removed by dubbing. It was a way of life and most game breeds are feisty, they make GREAT mothers as they will often tackle anything that bothers their chicks. It's in their genetics.