As a non-professional novice of home decorating, I'm learning through experience. Unfortunately.
On the upside, this room has a fairly consistent scheme of colors with which we are very happy and our individual pieces blend well together.
On the downside, I made a purchase last weekend that poses some new challenges. I have not yet ever owned an item of leather-upholstered furniture this large. The density of the upholstery and the fact that it is a solid dark color makes the piece seem heavier than it is. So I lightened it up with a pretty Dash and Albert rug and am happy with this casual look.
The second challenge is keeping the rug in place over the slippery leather. I will be headed to Target soon to purchase a non-slip rug pad to place between the couch and rug. And hopefully that will work.