It's pretty simples if not a PITA.
Remove the 2 screws inside the inside of the handles of the boot trim. Now remove the boot trim, you just need to get your hand underneath a corner and PULL. Once you fell a few clips pop out just work your way around and it's off.
You can now see what's what. Loosen off the screws holding the wiper arm in as you'll need the room to get the handle mech out. Unclip loom from handle, remove screws and turn to release.
Just a case of doing Everthing in reverse now to get it all back together. I'm sure that's all......not done one of these for a few years.