Mistakes can be made no matter which method you choose to sex your pigeons.
I find the best way to sex a bird it to ask another pigeon.
Check out the link the pigeon bowing and circling is ♂ the bird walking is ♀:
Hi put two opposite sex pigeons together if they fight put them in two cages instead where they can see but cannot get to each other when you feel they're getting along put them again together about sexing I don't know how to tell you but with experience you'll distinguish between them you can't tell for sure from the first time!
You can always just put them all in together and see who picks who! They will pair off by themselves and if you want to switch them up later! I rarely pair birds up....I just let them pick out who they want to be with....Most of people who show birds think I'm nuts but who knows maybe the pigeons know who best is their mate.