Some people have an eye for interior design. They can look at a blank space or, even more challenging, a half-decorated space and know upfront how to evenly weight the practicalities of life and objects and personal style in one design.
Not everyone has this skill — I certainly don’t. And I certainly don’t have the means to hire an interior designer either. For everyone who’s in the same boat, luckily, there are cheap or free services available online.