Hi Arminius!
Ok, so the attack can work even if the machine is outside the network but you’ll need to use a wireless adapter attached to kali and connected to your home router, then you’ll need to set the port forwarding rules, this is covered in Section 14 of the course. So the first step is to get a connection back from the victim machine, then you can try to pivot to any other machine. But I will suggest to try it in the virtual lab first, I mean in your host machine and kali and windows as virtual machines attaches to the same NAT Network.

Hope it helps!
Diego