Before I install it, can you please clarify a few things?
1. "The scripts /etc/network/if-up.d/nat64-up and /etc/network/if-down.d/nat64-down start and stop the nat64d process."
Does the script need to be started manually, or is it started automatically at reboot?

2. Is it necessary for the script to be started in order for Skype to work?

Thanks.