We had a bad experience with an interior painter years ago, with the crux of the problem being him overcharging us at the end for "extra work" he didn't anticipate. One thing I'd strongly recommend is making sure it's in the contract that any additional work or growth work is estimated and communicated to the owner as soon as it is identified, otherwise the owner is not liable to pay it at the end.
Excellent advice because there are many unskilled workers who are "trying to pull the wool over the customers eyes". One has to study about the project for which they are in need. I happen to need dry wall repair and painting done in my home and feel the advice in this article will be a great help to me in hiring someone who is ethical and does good work. Thanks.