Have you ever tried to install a set of shelves only to find that the brackets get in the way? No matter how you change it around, you just cant seem to get it right. There is a type of shelving that can help you avoid this problem altogether, they are called floating shelves.
When you first get started on home interior decorating, it is a good idea to have at least some notion of the kind of color scheme you might like. That is not to say that you cant change your mind while you are working out a plan. It is much better to change at this stage than when you already have the paint on the walls.