My tried and true method [and I tell everyone] is treats. For you, some leafy greens [not a lot, because they are young yet].
To get my hand-shy animals used to me and my hands, I gave them leafy greens or a small piece of fruit with my hands. It will take a little time, but your pigs will start to associate your hands with food, so they'll be more apt to let your hands come near them or touch them because all they're thinking is, "Food!"
My pigs are skittish, but not biters. I sometimes have to use towels to catch my littlest one. He's quick!
These two charts tell you what fruits and veggies your pig can have.
Veggie Chart Fruit Chart