From what I've heard, you should wait 2 weeks before handling them. I start mine on scrambled eggs. They love the, and they're nutritious as well....I don't think its cannibalistic, tho some do.
I put a bunch of eggs on my hand and wait for them to eat off my hand while I talk to them in the voice I use to call my older hens. "Here chickie chickie....what's this?" Over and over til they chirp at my arriva.l I've found that chickens that like to be held will come to you when they are ready. The treats help to get them to come to you, but if a hen doesn't like to be held, she wont no matter what.
My favorite hen, a black austrolorpe, was held CONSTANTLY as a chickie and HATED to be picked up as an adult, tho she is the first to come running when I call.
My EE, HATED to be held as a chickie, chirped and struggled etc. Now she jumps onto the perch and begs to be held. Will sit still in my lap for HOURS to be petted.
There's just no rhyme or reason to who is going to be friendly....but treats help NO MATTER WHAT.