I'd like to know what you learned from messing up. I know this is an older post but hoping you are still around. I saw the broomstick method on youtube but I'm afraid I will mess it up.It usually takes between 1½ - 3 minutes for a chicken to bleed out. So it's not exactly that long.
Cervical Dislocation method/broomstick method does take alittle practice. I've messed up on it a couple times in the past, but now have mastered it.