You need to start by taking a close, objective look at the property. Walk around the exterior with a pad of paper and write down EVERYTHING that needs to be done to make the house look it's best. Do the same inside and then sit down and determine how much time and money you can put into making the property most appealing to perspective buyers. You may want to consider putting some of your belongings in storage to open up some space in the rooms and closets. This is usually one of the most difficult aspects of selling and sometimes it helps to have an unbiased point of view.
Certain repairs can bring you a return on your investment. Others, however, regardless of how much you spend, won't add any value to the property. While you want to be sure your home is as appealing to potential buyers as possible, you need to be careful not to overextend yourself on repairs before selling. Too often a homeowner will invest huge amounts of time and money in repairs just to realize that much of that money will not be recouped in a higher sale price. A couple of improvements that do usually bring added value are kitchens, bathrooms, porches, and the exterior.
It is very important before you do any repairs to be sure that the money you spend will be reflected in equity.

In some instances, slightly lowering the asking price for the buyer to make the repairs can open up your home to more buyers who may not be able to afford the home when completely fixed-up, but can put time and effort into the project, all while saving you the time and expense of doing them yourself.