1) Can you jump riding Western? When ever I read about jumping, it's always English.
Yeah, jumping is something done in the English discipline. :) Western doesn't include jumping...plus, I agree- the horn...OUCH! Lol.

:P I wouldn't recommend jumping in a Western saddle.
2) Do any of you tuck your jeans into your boots when you ride? I've seen it done before, but not typically. Just wondering!
Well I ride English...idk if it matters, but I have tall boots that zipper up- so yes, my jeans are tucked in. ;) When I wear breeches of course they are lol.

Now with short boots I don't think tucking them in is necessary, that's kinda tricky.