We walked from Montefiascone to Rome in September and organised everything ourselves staying at B&Bs and small hotels all booked through Booking.com
I used this website
https://www.viefrancigene.org/en/mappe/ to download gps tracks of the route so that if and when we went off track, which did happen a couple of times, we could easily see how to correct things. I also had the hard copy guidebook from the same organisation.
There are a number of alternative route options available to you as you go along, some involving quite a bit of extra mileage. Some of the newer options have more prominent markings than the originaal route so you do need to be alert at those points. EG The newer and longer way out of Sutri diverges at the amphitheater and crosses the main road whilst the less well marked old route continues around the back of the amphitheater.
The waymarkings often don't have arrows and are sometimes simply attached to the most convenient post or piece of street furniture at a junction. Take a moment to positively decide which way to go. It's easy to find oneself heading back down the alternative merging route and not realise this because of the lack of arrows.
We found it a quiet route, only seeing 16 other walking pilgrims in 8 days, and there are also few oportunites to buy snacks and replenish water between stage nodes.
The Italians we met were enthusiastic and helpful, especially the Swiss Guards at the Vatican, and the overall pleasure and sense of satisfaction was instrumental in our deciding to walk to to Assisi next year.
In summary, you need to be more self sufficient and to be better able to route plan than for the Caminos in Spain.