Veiled Chameleons. Not "Veil".
Many chameleons are aggressive, some are extremely shy, and some will tolerate handling. No matter their disposition towards you, handling needs to be limited. It varies from chameleon to chameleon, not species to species. No chameleon "Enjoys" being handled, they will only tolerate it. Handling will undoubtible cause stress, and stress leads to health problems and shortened ages. If you are looking for a pet you can handle, then you should rethink your choice on chameleons and look into other species of lizards. Maybe arboreal Skinks.
Some can bite hard enough to draw blood. They wont hesitate to bite if you do not show them respect. There are chameleons that will even charge at you if you come close to their enclosure. I'm sure they could do even more damage if you are working with the larger species. No chameleons will tail whip, as their tails are prehensile unlike species of lizards that will whip.
They will eat crickets, however, their diet should not be limited to only that. They should have a decent variety or feeders to cover all their nutritional needs. Each food source has different values, uses and rules on using them.
Cages should e appropriately sized for the chameleons size. So a baby youngue juvinile should not be housed in a cage that is as large as you mentioned. This is beacause captive housing and their natural habitat are so radically different, so you cannot expect a youngling to survive given that much space.