Prise out the trim cap and undo the screw securing the exterior mirror inner trim panel of door
Where a manually-adjustable exterior mirror is fitted, prise the rubber cover off the adjustment lever, then unscrew and remove the locking collar using pointed-nose pliers.
Pull the panel from its location to disengage the retaining clips. Disconnect the loudspeaker wiring connector and remove the panel.
Lift off the trim caps, undo the retaining screws, then remove the door interior handle surround.
Carefully prise off the loudspeaker grille then undo the three loudspeaker retaining screws. Withdraw the speaker from the door and disconnect the wiring connectors.
Undo the three retaining screws in the loudspeaker aperture, and the single screw in the oddments pocket just below the aperture.
Lift out the loudspeaker protective cover and withdraw the loudspeaker wiring from the base of the cover.
Prise out the trim cap and undo the screw securing the rear of the trim panel to the door frame of Fiat Punto car.
Undo the screw at the upper front corner of the panel, and the remaining four screws securing the lower edge of the panel to the door frame.
Using a suitable forked tool inserted between the door and the trim panel of Fiat Punto, release the press-stud clips located around the edge of the panel, then lift the trim panel upward.
Pull the panel from the door, noting that the lower window aperture weatherstrip is integral with the trim panel and must be released from tie door as the panel is withdrawn.
If work is to be carried out on the door internal components, it will be necessary to remove the plastic sealing sheet from the inside of the door. Start at one comer of the sheet and carefully peel it away, using a sharp blade to split the sealant bead, if necessary.
Store the detached sealing sheet such that it cannot become contaminated with dust; this will allow it to be re-used later.
Source (with illustrations) - Door inner trim panel removal and refitting FIAT Punto