how can i change door lock barrel in a fiat panda 1992

Ok first remove the armrest on the inside of the door ,then remove all the press studs holding the interior door panel. Unscrew the lock button on the top of the panel the interior panel should come free. u may find some plastic cover over the door frame carefully remove it so as to give u access (this plastic cover needs to be fitted back) If u put u hand up to the back of the door lock u will feel a spring clip holding the lock in place u need to remove this with a screwdriver or something similar. Once this has been removed next is to disconnect the lock linkage which may have spring washers keeping them in place,carefully remove these & u should find the lock is free to come out. Its a bit fiddlely just take ur time. Replacement is reversal procedure.
l hope this helps Regards MAC