The last big decision is how to apply the paint. Most pros use paint sprayers because they're fast, but in inexperienced hands a high-powered sprayer can leave drips, thin coats, and a mist that may land on many things other than your siding. If you do hire a painter who uses a sprayer, make sure he is meticulous about removing, covering, or masking off everything in the area that might get hit with overspray: gutters, roofs, windows, shrubbery, walkways, cars—you name it.
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Shopping for the right paint should go beyond collecting paint swatches or choosing a shade from the catalogue. Purchasing inexpensive paint samples and small brushes to bring home for testing is the best, because it's the only way to really ascertain whether a color suits the décor. The goal is to paint a small section of the wall — a square with an area of just a few inches is sufficient. Allowing the small painted patch to dry and observing how it looks under the lighting conditions at different times of the day should clear up any painter’s color dilemma.
The right paint stroke to use in interior painting is highly debatable. It's not a talent as much as a skill that is learned through practice. Many experts paint in a “W” pattern when using foam rollers, but others simply roll up and down then sideways with either brushes or rollers. The motion isn’t as important as making sure that the application is even and drip-free across the entire area. However, technique is important when you're covering over wall repairs.