Cup feeding is really helpful, but it comes in time. My cham used to see me grab her cup to fill it, and if I didn't go fast enough, she would sit right where the cup sat waiting for her food. The more you use the cup, the better and more comfortable your cham will get. I also did cup/hand feeding with my cham, so I held the cup outside of her cage and she came out and ate from it. After a while she would perch on the cup edge when she was hungry, so practice really does make perfect.