First, try to get yourself a stud finder. In case you can’t find one, then you obviously have to do things the normal way. These studs are extremely difficult to find behind dry walls and you have to look closely in order to know where exactly the studs have landed.
When you are looking for the studs behind the dry wall, you must look closely for places where there are slightly raised nail heads. The studs mostly rest on areas where there are nails and are found right behind these fasteners. The dry wall is quite soft once you press it. Therefore, keep pressing the wall until and unless it stops moving. If it moves, it means there is nothing behind it. But, if it does not, it means you have detected the stud which you were looking for.
Since you have almost found the stud, now it’s time for you to test your findings. You should drill a hole in the wall, just as a test, in order to know whether that stud is actually behind the wall or not. However first you must cut a 20-inch wire and bend it. After making the hole, insert one end of the wire into the hole and move the other end like a doorknob. Keep turning until you hit something and then move in the opposite direction to confirm that it’s a stud that you have encountered.
The rest of the studs are mostly 16 inches within the range of the first stud that you find. Therefore, keep marking the wall on places where you have located the stud. After you are done finding them all, you might notice that there are several holes in the wall and you will have to patch them all. It’s not a difficult task to patch these holes as they are extremely small in size.