If you're on FTTN there is no NBN box. It just uses the existing phone line to your house, you replace your ADSL modem with a VDSL one and you're up and running. NBNCo takes about 2 weeks to send someone out to cut you over from the exchange to the node at the pillar. Once you've been cut over to the node the ISP config is a back end change, my ISP claims their automated system can churn people in 15 minutes. No login details or modem configuration needed for most ISPs either so if you have the modem plugged in the day of install it will automagically be working when you get home.
So in short...unless something goes wrong you don't even need to be at home during the install window. Sign up and in 2 weeks or so when NBNCo gets their shit into gear you'll be up and running. As much as I hate the very idea of FTTN, I get about 70Mbps down and 30Mbps up and I can finally do something simple like upload a video to Youtube without it taking hours. It's changed how I use the internet.