Opt for Test Sizes
Before committing to a full gallon, first try out a few samples to really nail down which shade of a particular color you want. Available at most paint stores for less than $5 each, these little testers are just enough to cover a large wall area or sample board with paint.
View Swatches in Natural Light
It's common to fall in love with a paint swatch in the store then find the color looks drastically different once it's painted on your walls. This is caused, in part, because paint looks different under artificial light versus natural light. For a better idea of the finished color, always look at paint chips near a window.
Compare Paint Chips to White
Similar to using a quarter to show the scale of an object in a photograph, comparing any color against white will ensure its tonal values really clearly. When looking over paint chips at home, try laying them out on a white surface.
Live With the Colors
With so many options to choose from, nailing down just the right hue can be tough. To make the selection process easier, it's smart to test out several paint colors along one wall and live with them for a few days, noting how they look both day and night. Label the painted swatches with painter's tape so you'll remember which color you liked best.