The procedure would be, day1: select your leather from samples. Imported or local thick or thin are the choices with some color variations which you can choose. He will stitch them in a day. The next day you will have to get all your seats removed along with door panels. He will leave the driving seat fixed and after some hours or later in the day when you go back he will start fitting and in the meanwhile do the driving seat as well.
A tip and suggestion: the stitching line on the door panel is hard to manage, have seen even misalignment on US and Thai pictures so go for plain door panel without stitch line as I did.