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@jammy
The campy Athena group is a wonderful bit of kit, but you will need campag compatible wheels as they are the only company that are using 11 speed. 11 speed does require finer adjustments than 10, and that more than 9.... as long as you get it set up by a decent bike shop you'll be fine.
50/34 and 12/25 is 100% standard, and you shouldn't have any problems climbing with that setup. Lowest gear will be around 35GI and that's fine for hauling yourself up a hill provided you're out the saddle.