The easiest way to wear them is roll your jeans up exposing more of the boot but still having your long pants keeping you warm. The cuff you make by rolling them up should come just over the top of the boots.

You can do this even if you can't (or don't want) to tuck them into the tops of long boots. I'va also worn them with capri pants that hang about 1-2 inches over the top of the boot.