I can shoot a gun, but admittedly, I've never done it in a dress or skirt. However, I imagine it's not that difficult.
Cleaning chicken coops, horse stalls, pig pens, and such....again possible - but not high up on my to do list. Who wants a skirt getting in the way?
And riding a horse in a dress? I have horses and I've not tried it (although this post may have just inspired me to see what it was like), but I can't imagine I'd care much for it. Sitting side-saddle, for me, is a big not happening.
Imagine all the extra material you would need just to be able to maneuver on and off a horse.
I'll agree that I've always kind of wanted to dress like Scarlet in Gone With the Wind. The pretty dresses and gloves. But I have a feeling it would get old rather quickly.