To disassemble the handles it is necessary to remove the inert panels of the doors. It is a bit difficult especially if you have not done it before.
The first thing you are going to have to do is climb the crystals to the top, remove the inner handle, remove the door handle, the slide tray if it had it, the window of the windows if it were manual ...
Once this is done, the inner panel carries some plastic staples that hold it to the door of the door, you must let them go one to a careful to break them, and once the panel must be released. You will see the knob or handle from the inside.
To remove it, you must also remove the blade that carries the handle and find a way to release it from the door, (some are going pressure, others go with screws from within, etc.)
The best thing if you have never done it is that you lower the workshop manual of your car so you can see everything detailed step by step according to the illustrations since I have not disassembled any car like yours.
Another way of learning is going to scrapping to remove the handles from a car like yours, since apart from being much cheaper than if you buy them new, you will have to disassemble the entire door as in yours, with the advantage that if you break something nothing happens.
By the way you take advantage and take the plastic staples just in case, the group of the crank of the windows that always breaks, some fuses around here ... some lamps over there ... etc.
It is a bit more shabby but more grateful for the pocket.
All the best.