Handle them enough for them to get used to you, and understand that you're not a threat. It may mean small moves at first. Example would be cradling them in your palm without actually lifting their feet completely off the floor and then letting them go. As they get to be okay with that, lift them higher and wiggle your hand so that they get their feet up enough to stand on your fingers, still low to the floor, allowing them to hop off when they want to.
You'll learn your way around them. The one thing NOT to do is to chase them in any way at that age, on foot or even with your hand. Those that are going to will come to you in time. Some will come in on their own, and others will follow out of curiosity. A shiny ring on your hand will bring in some that are more shy. Some will not have anything to do with you.