When working with (potentially very high voltage) electric fences, you must ensure you are sensible, and follow all safety precautions possible. Do not put your head or upper spine anywhere near an electrified fence; never encourage anyone (including yourself) to touch an electric fence; make sure the power to your fence is switched off before working on it; make sure it is properly maintained. Wear appropriate clothing and gear, and if worried, contact a professional engineer to help you install it.