This is for the doityourselfers.
This is pretty detailed so you might want to pick up an owners manual and perhaps a trade dictionary.
Okay. First rule.
Don’t cut the main line. If you do, you won’t have a phone.
Rule two. Make sure you don’t trim away entire main line so that you can’t even splice it to repair ignoring Rule #1.
In completely unrelated news, my home phone doesn’t work. Please call Kari’s cell if trying to get ahold of us. Though we probably won’t answer it either.