As far as I can remember.
Pull wipers away from windscreen as if you were cleaning it.
Open bonnet.
Pop off black covers over Nut that secures wiper arm.
Undo nut.
Remove washer pipe connection.
Arm then just pulls away to remove it.
You will have to unclip the washer nozzles and pull the rubber washer pipe from the wiper arm.
Then clean sand smooth and respray - I used primer and then matt black.
Refit is reverse.