Haven't done it in years, but it seemed simple.
FWIW, I could typically wait until day two to log in first time. Used cellular service to cover most of day 1. Then hope for a port on day 4 for more cellular coverage. And finally activate 2nd 48 hours on day 5, the value of 48 hours was generally enough to get last 3 days for the price of two. This was Freedom/Oasis in 2016 and 2017