For the ones who aren't social, hold them as much as possible Even if they try to run away, enforce that you will hold them, and let them go when they calm down.

A good thing to try is to try and get them to take food from your hand. It took Icarus about a month to trust me, and even longer to take food from my hand. Now he's as sweet as can be

Noah must be like Frisco Frisco was never scared of me and loved to be held. After that stage though, he grew into his hyperness. Now he just wants to run around like crazy

Good luck