To have a 9-foot sofa in a small room can be kind of treacherous.
To be influenced by a magazine and, say, a Swedish theme, unless it resonates with you, it seems kind of odd and influenced.
Think of how much furniture you need. What's the best way to have it be functional in a great way? If it's in groups, define it.
People buy things in isolation and don't think of how they work together.
Avoid spending too much on one thing.
People buy very badly made furniture and fabric. Instead, buy a beautiful dining table, well-made upholstery. It's almost like dressing for success.