First Assess Your Space
First, you want to assess how functional your current arrangement really is. Do you find yourself bumping into furniture, or straining to have a simple conversation with another person in the room? Often, once we plunk our furniture down in a room, it never really moves again. It's literally stuck and so are we. Assess what the function of the room is - what happens there and who uses it and determine if the furniture currently in place support those needs. Often, we don't need to buy furniture, but we actually should get rid of items. If you are not using something -- a television set, Grandma's wing chair or a small table for instance -- then consider if they can be used in another room of the house for another purpose, or donated to a local charity.