Mind the Rug
Be mindful of the size of the rug you choose. If you accidentally get the wrong sized rug, it's like buying a pair of shoes that don't fit. You should send it back (or, like, go back to the store with your receipt).
Keep the Proportions Intact
When you're styling a large room, you should find a rug that, at least, fits underneath the front legs of your furniture. The rug should frame the room for you. Don't be afraid to question your own rug choices. Consult the experts.