Research recent listings and, where available, actual transaction prices for comparable properties in your locality and configuration, rather than relying solely on what neighbours claim their property is "worth."
Overpricing can lead to a property sitting unsold for an extended period, which sometimes makes buyers suspicious about why it hasn't moved. Underpricing, on the other hand, leaves money on the table unnecessarily.
A property consultant familiar with your specific micro-market can help calibrate a realistic price range based on current comparable activity, rather than guesswork.