Nebelung cats are timid and take a while to adjust to changes. However, as you're getting your feline while they are still young, the process is generally not so stressful for them. However, this all depends on how comfortable and welcoming you make their new environment. Confine them to one room for a day or two and set up a cosy space there. Additionally stay with them as much as you can during the first few days to help them settle.