Hello and welcome to BYC!
My first flock were all black australorps and I thought the same thing, how in the world will I tell them apart! When they were chicks I actually made notes on paper...Tillie had a white spot on her head, Molly had an all black head, etc... As they grew I could start to see subtle differences. When they were adults I could really see differences in comb shape and size, face shape, height, etc... Stare at them long enough and you will be able to identify each one in a flock of 10+ birds!
Welcome aboard!

My first flock were all black australorps and I thought the same thing, how in the world will I tell them apart! When they were chicks I actually made notes on paper...Tillie had a white spot on her head, Molly had an all black head, etc... As they grew I could start to see subtle differences. When they were adults I could really see differences in comb shape and size, face shape, height, etc... Stare at them long enough and you will be able to identify each one in a flock of 10+ birds!
Welcome aboard!