Putting a hole through drywall is difficulty, but doable. Depending on the size of the hole, you may need the assistance of home repair contractors, or you may be able to repair the damage yourself. 
To fix a hole or gouge that is less than one inch in diameter, you should first use a utility knife to scrape away any jagged edges so that there are no materials bulging from the wall’s surface. Use a broad putty knife to apply the first layer of drywall compound. Make sure that you precisely follow the directions and that you do not apply a layer that is more than 1/8 of an inch thick. Smooth the surface with the putty knife and allow the compound to dry. Then, add a second layer of the compound, and repeat this process until the compound layer juts out a bit further than the wall. When the compound is thoroughly dry, use light sandpaper to make it flush with the rest of the wall. Now, the surface is ready to paint.
A larger hole will require more work to fix, so you may want to hire the services of a company that employees home repair contractors. For more information, visit TotalHousehold.com.