In Australia the studs are 450ml apart, no idea about in the US. Knowing the standard width between studs would help you. John just demonstrated the difference in sound (not that different to my untrained ears I have to say!). You can get a stud finder from the hardware. That would be the easiest and safest method. Then you won’t be there rapping all afternoon… well unless you and Milo fancy getting into a bit of rap.