It's really simple. Sometimes they get stuck solid but I've done 2 or 3 and they weren't an issue.
It's been a while so this may not be exactly right, but as I remember you just remove the bolts for the wiper motor, remove the nut at the base of the wiper itself (on the outside), plus a black plastic nut which you may have to get pliers on and it should slip straight through. Done.
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