The first four things I would do:

Get an Ancestry account. Probably it's 50% off during Christmas week. Call them and say you want to spend about $75 for 6 months of World Explorer and that you can't afford more. They will offer you a cascading $90, $85, $80 etc.... Don't budge until $75 and tell them politely you are going to hang up. You will get $75 -$78.

Build a family tree in ancestry that demonstrates the line.

Search the Antenati site I linked to find your relevant ancestors Italian birth and marriage certificates. It will take a few hours. You don't need to read Italian, just look for the names.

Find a lawyer in Italy and arrange a call. Send them a copy of your family tree (ancestry print option). Listen to what they say and consider to call 2 more.

Decide if you want to continue with the process.

I don't regret anything. I have already passed the citizenship to my own descendants and they can qualify for work and free health care and University education in Europe (but only with residency in Europe, strictly). This is life changing. It was also an extremely fun process to follow through to the end.

The worst part for most people is getting all the names and dates on the ancestors documents to line up. Usually they don't and you have to deal with civil registry offices. The other worst part is waiting for apostilles.