I would contact your lender first. Depending on the mortgage company, there may be a hardship package that needs to be completed first. They may also have a time requirement for the home to be on the market that would result in the lender being paid in full. For example, they may require the home be on the market for 6 months before you can reduce the price to an amount that would result in a short sale. And as Gloria advised, it is highly beneficial to use a short sale negotiator. Can you do one without one, technically yes. Are your odds much better to get the short sale closed with a negotiator - absolutely!