no special tools required mate, i done the clutch on my 1.2 -3door, and the only thing we didnt have was the clutch lining tool. i lined the clutch with my finger, lol, proper job!

yeah casing on the stilo came away 100% mate, just make sure you have all the bolts out, lol i made that mistake on a 2002 shogun, top bolt was still in place and i broke the casing, whoops. lol. got the piece welded back on and it was a good job.(pig of a gearbox to take out, its about 4/5 feet long.)

keep us posted mate.

i think mine was £60 mate, i got it from a local car parts place just.

here you are £69: 3-in-1 Clutch Kit, Fiat, Stilo, 1.2i [QKT2448AF] - £69.90 : Parts Junction UK - Car Parts and Accessories, Your One Stop Shop for car parts and accessories

i dont know about the 1.2 but im assuming its the same, make sure you remove the complete gearbox mount under the battery tray, dont just unbolt and leave the rest in place.
the mount gets in the way when trying to put the box back onto the engine, it took me a hour of messing around on my car before i realised that it was this preventing the box going in.