When it comes to wall repair, some damages can seem irreparable. However, even for giant holes, there is a solution. Many damages to the wall can be fixed with a patch and repair kit. All you need to do is go to your local hardware store and ask for a wall patch. You will also need to buy some paint in the same tone and color that the wall is in (if you like seamless repair). The kit comes with some putty and a screen to put over the hole. Just place the screen over the hole, seamlessly parallel to the wall so that it is flat over the hole. Make sure to not apply too much pressure over the screen so that it remains flat, then, with a putty knife, spread the putty over the screen and push it into the hole through the screen so that it fills into the damaged area. Keep spreading the putty over the screen until the hole is covered, and continue to spread light amounts of putty around the mesh until it is all completely covered. Make sure that all the putty you spread is seamlessly flat with the wall, and let it dry. Come back a few hours later, and the putty should be dry. Wait until the putty is fully dry to begin painting with the matching wall color. The repair kit costs about ten dollars USD, which is a very affordable repair to that wall.
However, if you are more comfortable with a certified professional as opposed to yourself, go with your comfort, and keep your real estate investments in tip-top shape.