When making repairs to your home, try not to do anything expensive, such as remodeling. Consider paying for any repairs out of savings rather than running up credit cards. You will likely be buying another home and you don't want to do anything that could affect your credit scores or damage your ability to obtain another mortgage.
Plumbing and Fixtures
Check out all your sink fixtures. Do they look new? Do they sparkle? A good cleaning and polishing will probably bring them to life. If not, consider purchasing some inexpensive replacements.
Make sure that your faucets turn easily and do not leak. If they leak, replace the washers. This is not difficult.
Remove all stains from porcelain fixtures. If you run into a particularly tough stain, consider consulting a professional.
Replace any broken tiles in shower or bath and re-caulk if needed.
Painting
Look carefully at your walls and ceilings. Are there old stains on the ceiling caused by a leak long since repaired? Are the walls smudged, dirty or just tired looking? Do you have an outdated color scheme? Don't forget the colors you chose to accent your furnishings will almost never work with your buyers' things.
Painting can be a great investment when selling your home. It need not cost much and many times you can do it yourself. Choose off white or cream colors as these will work with anyone's furniture and will also make your home look spacious and bright.
Wallpaper and Paneling
Repair wallpaper if needed. Polish woodwork and paneling.
Carpet and Flooring
Usually a professional cleaning is all your carpet needs. But if it is really worn out, badly stained or an outdated color, replace it with something fairly inexpensive. Once again, choose a neutral tone. (They don't call it "REALTOR® Beige" for nothing!)
Replace any broken floor tiles and clean any badly stained grout. Again this can be done fairly inexpensively.
Door and Windows
Make sure all your windows open and shut easily. If they don't, try some WD40; this often corrects the problem. If you have broken or cracked windowpanes, you should replace them.
In Texas, many homes have thermal windows. As they age, these windows lose their vacuum seals, and condensation forms between the layers of glass. In the early stages, this is often not particularly noticeable. Later on however, these windows become unsightly and sometimes even opaque. If you have badly fogged windows, you should seriously consider replacing the glass. It will be an issue for your buyers!
All doors should open and shut easily also. If they squeak, try the WD40 on the hinges; this normally fixes the problem. Make sure all the knobs are clean and polished; remove any smudges on the doors.
Appliances
All your appliances should be in working order. If something doesn't work either replace it (again with an inexpensive model) or have it repaired. Have your air conditioners and furnaces serviced and any repairs or adjustments made. Remember all these items will be checked by your Buyers during their inspection.
Odor Control
Smells are important and bad ones can be an immediate turnoff to your potential buyers.
If you smoke, strongly consider smoking only outside while your home is for sale. You might consider buying some ozone spray that helps to remove orders without leaving a strong scent behind.
If you're a pet lover (and I am), you will have become used to the odors left by pets. Your buyers, however, will notice it immediately. For those with cats, make sure the kitty litter is cleaned at least daily. If your kitty has confused the carpet with the litter box, use an enzyme odor remover where the accident happened. Sometimes this works. If it doesn't, you really need to consider replacing the carpet. Consider using a carpet deodorant each time you vacuum; this helps remove any doggy odor.