Most folks would agree that in painting, like in most activities, practice makes perfect. So it's probably a safe bet that a painting contractor with sixty years in the business is probably and little more practiced and more likely to achieve the painting perfection you seek than first-time DIY efforts. If your looking for that homemade, kindergarten, colored-outside-the-lines look, then by all means DIY, but remember, even if you don't mind substandard results, DIY also stands for Don't Injure Yourself.