Your question is a common one right now. A couple things; no one knows exactly when the market will drop out and in order to sell in this market a seller has to have a different mindset.
Right now the market is flooded with homeowners who want to sell, but do not have the motivation or need to stick it through in this market.Their homes are usually overpriced and are on the market longer. They also tend to expire without a sale.
Patience is not only a virtue but a requirement. There is a lot of inventory out there for buyers to choose from, you want to make sure 1. they know yours is available (marketing) and 2. that it priced competitively-- the faster you need to sell the lower under market value it should be.
Work with a Realtor who has an aggressive marketing plan. Gone are the days when we can place a home on the MLS and a sign in the yard. Trust and much communication with your Realtor is needed more than ever.
Keep in mind that the money you may lose in the sell may be made up in your next purchase. The choice is yours, if you do not have to move and you are having a hard time with not getting what you think your home is worth (market value is what a buyer is willing to pay and what a seller is willing to sell for) then maybe you should wait it out.
I address this and more on a presentation that I use for a webinar "What It Takes To Get Your Home Sold in a Shifting Market". You can email me if you are interested in a copy. Again, no one knows when the bottom will drop out so you need to be okay with waiting 1 year or 3 or more. But if you need to move, be willing to do what it takes so that you can move on to the next phase of your life.
I hope this helps.