Hi,
Welcome to Talk Budgies
It is normal for them to be nervous at first, just do not try to touch them and make sure that no one in the household sticks their fingers or anything else in the cage and do not let them out of the cage just yet, it is too early for that. When you change the food and water move very slowly, you may find that they freak out at first and fly erratically all over the cage, they are afraid and it takes time for them to learn to trust that you are not a threat to them. It takes at least a couple of weeks for them to settle in, during this time talk softly to them and do not make any fast moves around them. It is best to have the back of the cage against a wall as this gives a sense of security to them. You may find this info helpful Yes, Your Bird IS Scared!
Welcome to Talk Budgies
It is normal for them to be nervous at first, just do not try to touch them and make sure that no one in the household sticks their fingers or anything else in the cage and do not let them out of the cage just yet, it is too early for that. When you change the food and water move very slowly, you may find that they freak out at first and fly erratically all over the cage, they are afraid and it takes time for them to learn to trust that you are not a threat to them. It takes at least a couple of weeks for them to settle in, during this time talk softly to them and do not make any fast moves around them. It is best to have the back of the cage against a wall as this gives a sense of security to them. You may find this info helpful Yes, Your Bird IS Scared!