Find a patch of a couple feet wide in the general area that you’re wanting to find a stud. Use a finger knuckle to tap on the wall noting the tone that’s made. Move laterally in one direction, continuing to tap the wall. As you get closer to a stud, the tone should get shorter and slightly higher. As you move away from a stud, the tone gets deeper. This method will get yah relatively close to a stud. Then, in an area that’s less conspicuous, maybe near the floorboard, use a small finishing nail to tap into the wall. If it pops through easily, no stud; keep moving in one direction about an inch and a half laterally from the original hole. If you’ve gone maybe 6-8 inches in one direction and by the tone you can tell you’re going in the wrong direction, just pop back to the other side of your original hole and move in that direction.