I sold my home a year ago in Phoenix, so I feel for you in the months to come. I agree with the advice you've already been given...
I would say when you go through each room....edit, edit, edit! I spent a little money for a small space in a storage facility and boxed up everything non-essential to put in storage. It wasn't that expensive, and made it a lot easier to keep things clean. I stored most of my kids' toys (way easier to keep the play-room tidy, and they picked their favorite things to stay), most of my books (so I could use that bookshelf space for pretty but anonymous display pieces), anything extraneous or personal (clean the magnets off your refrigerator and take down your bulletin boards!) Less is definitely more.
Neutralize any paint colors that may look great with your stuff, but won't necessarily go with someone else's. (Your walls don't all have to be white, but someone else should be able to visualize their stuff in your space.)
Update anything super-outdated as far as fixtures and upgrades are concerned. Don't overdo it, but if everyone in the neighborhood has granite countertops and yours are laminate, you might consider the investment. There are also some cheaper, updating short-cuts in some areas. (I used an antique bronze-finish spray paint on all my brass bathroom fixtures and you would never guess. Also, simply buying new pulls for cabinets and drawers can update a room)
Invite a friend with a good eye to come over and help you arrange your furniture for the best flow and use of the space...it always helps to get a fresh point of view.
Get the carpets clean, clean, clean!
Then, develop a thick skin, because no matter how perfect your house may seem to you, in a buyers' market people can afford to be very picky. Don't take it personally.