If you have a permanent residency, you need to have the local license.
Up to now, every time I was stopped, I put up my most beautiful smile and worst accent, and told the cop that I don't have a DNI and am I still in tramite. I talked myself out of it.
Now I have my permanent residency, and I had a car accident. I gave the other party my passport and international license; later my insurance company asked for a copy of all the pages in my passport, they had to see if I was by any change a permanent resident and would deny to pay.
Turns out that once you have permanent residency, you have 3 months to get the local one.
I went to ACA and this is what I should do :
make an appointment for 3x2h (3 days) lesson on conducto vial, then have a theoretical test and a medical test and after that a practical test.
I am starting in march... Will be able to give you all the details by then!
If you don't have permanent residency, you cant do this at ACA and must go to La ROCCA, and as Steve said, to be avoided...