RE: button bucks
another thing to look at besides the short stubby nose is the "square" body--meaning between the front shoulder and hind shoulder is more of a square shape...an adult doe will have a more elongated body (so it will look like a rectangle.
I've been told that abutton buck's head is more flat than a doe's...but that could be really tough to judge.
There is also more white on the face of a doe, and my dad has told me that a button buck will have more black hair on the top of its head...I've never noticed that though...I usually judge it by the stubby nose and don't think twice about it.
It really helps if you have a trail camera so you can "practice" picking out a button buck and a doe, too.