It's okay to receive ballpark figures over the phone however, insist upon an in-home estimate. A quality painter will help point out why certain parts of the project might be more expensive and can even talk through the repair process if it's necessary. A painter should also ask questions regarding access to the painting site, where they should park and if any HOA rules prohibit hours of work.
Even if you think you'll probably do the job yourself, it's good preparation to seek estimates from professional exterior home painters near you. Then you'll have a financial point of comparison and you may benefit from what a home painting contractor has to say about the condition of your home, color choices and types of paint available. Let the painter make his pitch for a professional job before you decide what to do. You can still opt to do it yourself while having learned something worthwhile. Home Painter