I tend to sit on the fence here. So much depends on your individual cham's tolerance. Generally chams don't enjoy being handled, but occasionally is OK and your cham should learn that some handling for cage cleaning, hand feeding, being carried to a favorite basking spot in your house, etc. is to be expected. As you get to know yours he will tell you what is too much. Signs that he's stressed will show up in various ways. He will flare into bright colors more often and more quickly if he's being disturbed too often. He will eat less and hide in the cage more. Most chams bluff and bluster if they don't want to be disturbed, but they don't always follow through all the way to a bite. If he really avoids your hand when you try to take him out leave him alone. If he lets himself be picked up or climbs toward you he probably wants a trip out of his cage for a short while. Turning bright colors is not a sign of happiness, it is excitement or stress. Turning a very dark color, hissing and lunging is extreme stress.