Besides the academic program, you will need to fix the most important things ahead:
As a PhD student, you may need special arrangements regarding practical preparation, such as housing, possibly kindergarten and/or school arrangements if traveling with family. Some of USN's partners will have an infrastructure to take care of this, but the vast majority are based on international students and research candidates arranging this privately. However, most people will have a contact at the institution who can support you in the process.
International Relations Section can assist you in finding the right contact person at the host institution.
If you are traveling for a shorter period (less than 3 months), it is likely that the host universities do not have housing available in many cases and you will have to arrange housing privately.
For further questions regarding exchange from USN, please contact the International Relations Section.