It's a b***h to replace these wiper blades!
Did mine yesterday, there's a clip that slides up, it's very tight so be patient - i broke the clips on the original wipers but my replacement Audi OEM one's came with clips.
Should be a straight swap from there on.
When sliding the clips back into place I found it easier to have the wiper flat against the windscreen and then slide the clip till it clicks into place.