Work with a professional painting contractor. If you haven’t done so already, sign on to work with a painting company near you. As part of a professional team, you’ll learn the tricks of the trade and work in a variety of different environments, both commercial and residential. There’s no better way to accumulate practical experience than to do it on the job.
I agree with Jeff below, these prices are far below what I see on the market in the Portland Or. area. When one uses the term "paint the house" what exactly does one mean? Any fool can buy an airless paint sprayer and put paint on a house. New homes built with fiber cement siding paint clean and easily but older homes built with wood require much prep work.
Sean and TJ painted the entire interior of our townhouse and were a pleasure to work with. Excellent job of prepping and cleaning up at the end of each day. We changed our minds on the color selection of our downstairs walls TWICE, but they didn't make us feel like idiots (even though we felt that way) and were patient with the process. Bryan, the owner, is detail oriented and very easy to work with. We would definitely recommend them!!!
Some contractors work on time and material others on a firm contract. I would never hire the former and am leary of the latter. A contractor may low-ball a bid to get the job planning to make a killing on change orders. If you say good morning to them, they charge you extra for that. If the contract is not very, very specific and extensively fleshed out or if they display their change order schedule prominently on top, show them the door.