Love the pics. He is a cutie. As for the picking and pinching. To a degree he is testing but most likely it is because he is still a baby. All baby humans but everything in their mouth, parrots do same with their beaks. Also he still does not understand you are not a bird and that biting hurts you. As a baby he would bite his nest mates feathers to get their attention and preen. You are his new nest mate so he is trying the same. Try gentle beak technique to help him to understand the difference.