Have a look at this link and a vid there Mook, might help you with airbag removal.
https://www.fiatforum.com/500-guides/313665-how-remove-change-fiat-500-steering-wheel.html
Helped me when I was swapping Pandas steering wheel for Abarths one. Ideally u want a took as close to airbag removal tool as possible as it will fit better. Which is basically a medium flat screwdriver that was bent in the middle into "L" shape. U have to pop 3 clips first with the engine running so u can turn the steering wheel to get to each clip. DO NOT force, if one of the clips dont pop then turn steering wheel for better angle, its all about the angle here

. If u turn wheel in the right angle and get behind with a torch u can actually see the clip to give u an idea how to deal with it. Its not hard u just need to see how to opperate the clips. Once all 3 popped, DO NOT REMOVE airbag. Switch engine off and disconnect the battery. Turn the key on and switch different lights on in the car to drain any voltage left in the system. Now u can remove airbag.
Good luck
Hope this will be of any help to u Mook.