Before you start make sure you have the proper stretchy belt. A standard belt the same size will not work.

I managed to roll off the old one but cutting it off is fine.

If you roll it off you at least have a belt to try the tool required as a trial.

To refit a special tool is required. I bought one but the clearances on the Abarth are too tight to use it. Other models may be OK, so I had to fabricate my own. I made this difficulty 2 because of this. It is really a basic difficulty 1 if you can borrow a tool.