I got a batch of different breeds, PR, BO, EE, and Light brahmas. The ones that were most interested in jumping onto my finger or arm were the BR's. They seemed pretty friendly right off but I started picking them up as soon as I got them.
I hatched some standard cochins and everytime I open the door to the brooder they all jump out onto my leg! They are so interested and friendly.
I have never had RIR chicks though.
I would say hold em alot two at a time so they have a buddy with them. That way they get used to it early.
My rir, though they are classified as a docile breed, were much more wary of my contact than my buff orps and barred rocks. But still, you should handle them every day if you want them to get used to you. Don't let their skittishness ward you off. They have to learn from you that you are safe, and you are the provider. Another thing to do to get them a little less afraid is to feed them from your hand, especially if you have a treat for them. It's a little early to do much with treats yet, but when you start, food is the way to the heart of a chicken, hands down.