Just use the crawl on your hand rule. If they wont crawl on your hand with a little nudge then dont handle them. Some will hang out on a finger and eat flightless fruit flies, others are not as hand friendly (never seen a baby lunge at a finger before).
Start with just having the hand in the cage. Then have the hand put bowls of treats (something other than his staple diet) in the cage when the cham is ready for some cup feeding (babies wont really cup feed till around 90 days). Then work your way up to trying to get them to eat while the hand is in the cage. Then eat from the hand something extra wiggly. At this point i try to get them to eat a staple food from my hand like a cricket. Once they will eat a staple, try to get them to move towards you to get the food, lead them along. Next step is eating on your hand, and the training is complete. Hopefully by that time they want to have hand rides.
With my guys training(6 months old and eating full size crickets), I can get him to crawl on my hand by putting my hand under his 2 front feet. The tail is some times a problem, but he never curls it(a sign of stress). Once out of the cage he will crawl onto a 4 year old kid and hand feed crickets. I still cant pet him in the cage, but then again ive never known a cham that liked touched other than maybe under the chin.
