Sit with your knees to the cage, and wait until he comes out onto them.Using your hands and arms as guards.
He'll start by doing the same he's doing now, he come out and run right back in again.
He's testing you, so play his little game. Don't grab at him, just let him walk around your legs, and check out as much as he wants, keeping his cage right there so he can run right back in when he wants.
He'll soon realize your not going to grab him, and will keep investigating a little more each time.
As he gets comfy with this start touching him a little more each time. A scratch behind the ear, or under the chin, to a full stroke of his back.
One little scratch at a time. When he's not running back at your slightest move , you'll know he's learning to trust you.
Once he's used to the touching, start cradling your hands around his whole body and just holding him for a second.
The pick him up, give him a kiss and set him back down in your lap. If by this time he's not running right back to his cage, he's yours.
If you do it slow, and with out rushing him out, you'll be able to do what ever you want with him.
Sounds like he's under a year, so he's still just a teeny bopper and you know how teens are, a little on the wild side.
It just has to be at his own pace, but this method works well for those of us who want to handle them lots.