Even if you are certain that you have made the perfect choice, it is still worthwhile to invest the time and money to get a sample and try it in your space. The way paint colours seem in your house can be very different from how they do in a paint store or online. Instead of painting little splotches all over your room, paint a poster board in the colours of your choice, then tape it to the wall. Move the poster board about the space to observe how your colour responds to various lighting conditions.