A professional paint crew will have the right tools for the job. Quality tools can make a difference in paint application and bear noticeable results. If you are only painting one room or do not plan to paint any additional areas of your home, it might not be wise to invest in tools that will only be used once. Professional painters will also have enough drop cloths and other protective equipment to ensure the area is kept clean.
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.
Tony and Travis came to the house to give me an estimate and were able to come back on two day's notice to do a wallpaper removal job for me. They stripped the paper, patched and primed in 1 day and were very clean and efficient. They were very willing to answer all my questions and even helped me with an unrelated paint issue. These guys are top notch! I'll definitely be calling them back for my future projects!