Tim's words of caution are good advice.

If the connection to the house is removed (No need at all for it with cable) there is still a slim chance a phone tech may try and reconnect it. Most people suggest tagging the box with a warning.

A modern NID usually has RJ-11 connectors that simply unplug like you would unplug a phone.

Its amazing that ATAs of 2010 do not have protection, but they reportedly don't. Going wireless provides complete isolation. Even lightning would have to take out the modem and perhaps the router before damaging the phone system.