The hardest bit to do is to push the pistons back into the bores, to allow you to get the pads in (as they push out over time as old pads wear). ON our big audis the brakes are so heavily over assisted that there is a special hyrdoulic tool to do this (which only audi and some other garages have), and we couldn't get one so had to improvise with a steering wheel lock, and two borrowed neighbours (to hold one end of the bar, and the other by us two.
Fiats been smaller cars are much easier, you can do it with a flat screwdriver, and some heaving.