Whether doing it yourself or hiring someone, buy the best quality paint you can afford; it lasts longer and in some situations requires only one coat of paint instead of two. Painting a room usually involves prep work, primer and latex or alkyd paints with a range of finishes. HGTV.com gives a quick overview  as well as a list of painting dos and don'ts .
Interior paint itself costs anywhere from $12-$50 or more a gallon, depending on the quality. Painting a 12x12-foot room, both walls and ceiling, can require $25-$100 worth of paint, plus $10-$50 for primer, brushes, rollers, drop clothes and other supplies. For a 1,500-square-foot home, supplies run $200-$300 for average paint, and $400-$600 for higher quality.
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If you're thinking about selling your home, you might want to repaint areas that look especially worn, dull or chipped so your house looks fresh and new to potential buyers. On the other hand, it’s possible some potential buyers will repaint the home upon moving in. So if you have a limited budget, your money (and time) might be better invested in other types of home projects, such as remodeling your bathroom or kitchen, installing new floors or fixing broken appliances.
People need to realize that if you want a licensed, insured professional painter in your home that is reputable, trustworthy & skilled, that it will cost them an average of $400.00 a day. If you want a nice paint job then it is all about prep work. There is tarping, plastic, furniture moving, caulking, spackling, sanding, priming, sealing, before you even paint. I have repainted interiors that were painted less than a year because the last contractor came in with a cheap price, did zero prep work, & painted with watered down paint. My point, A house is usually the most valuable asset a person will purchase, so why would you let just anyone with a cheap quote work on it? “The bitterness of poor quality remains long after the sweetness of low price is forgotten” – Benjamin Franklin