i've been pretty luck with my little girl, Loki. The first time i fed her i just put the crickets in with her and she ignored them so, i went to the kitchen, grabed a pair of chop sticks and tried to see if she would eat from them. and Bingo! It worked.
I didnt realize that i was doing it correctly by holding the cricket at a distance and below where she was perched, but from exp. with other animals making yourself small and less threating usually makes and animal feel more comfortable.
When I feed Loki mealworms I put them on their container lid and hold it my hand and she eats from it. So my sugestion is try putting the insect on something or hold it by a pair of tongs and each day move the insect closer and closer to your hand until your Cham will eat from your hand.
This morning during feeding time, i tried pure hand feeding with Loki for the first time. I used a mealworm and placed it in the palm of my hand and held it low and away from her. And she took it from my hand. I was really surprised and extremely happy!!!
*SIDE NOTE*
I am aware that mealworms can be hard on the digestive system for chameleos and am looking for a suplier of silk and or superworms.