Great work - you pull the chrome/stainless cap from the splined shaft, try and hold it as parallel as you can otherwise it doesn't want to come off is my experience. Make a mental note or mark the shaft relative to the arm as it will save the trial and error when refitting, it's easy to scuff the screen surround otherwise when the wiper over sweeps.
So the wiper arm just pulls off ?
2008 XXVII Platform, Bugatti Blue Roadster 4 Seater