its fiddly, the original pedals need drilling, its hard to get the drill in because of the dash, throttle/clutch aren't too bad as you can push them down, brake doesn't go too far though. Holes have to be accurate, there is limited space under them to get the nut on, so little you can't get a socket in because of the pedal edges, on one i ended up with a screwdriver wedged against nut to stop it turning!
Later cars might have holes already drilled as Brera S comes with the alloy plates, i can't believe Alfa do what i did and fit them in situ !
I'm now going to embarrassingly admit it took me almost a full day to get them fitted how i wanted!
worth the effort though, they do look good when fitted,