Back to the subject. The best way to learn trapping and snaring is to get someone with experiance to take you out and actually teach you. Baring that read what you can and then practice to see what works in your area. As what work in one place may be totally wrong in another. One size does not always fit all.

Here is a very good source of trapping information.
Buckshot's Camp

Buckshot is and experiance trapper and a fellow prepper.