You WANT TO SELL your home and YOU WANT THE BEST PRICE FOR IT!  The way to get there is to ask your broker to supply you with a cma.  If you just pull a number out of your hat because that's how much you would like to get, or that's how much the house up the street sold for 3 years ago, WRONG.

First, choose a broker that you can trust what they tell you and you can trust to do business with and then let them do their job.  They  can search the mls and other public information sources to find out what similar properties like yours have been selling for and they can justify that price with comps with pictures, etc. Your chosen broker can tell you the average number of days it is taking to sell a house and help you figure out what to expect.

Choose your broker carefully, the two of you are going to get well acquainted for the next short (hopefully) period of time and then work with them because if you've chosen correctly, the two of you are going to have the same goals.