@daze,
A70 TP is very simple and easy to cut, because TP line is on PCB surface (not in second layer like x55 or x60 phones), and all you need is to cut it carefully with something sharp and thin (I use blade cutter).
If you are not so sure about your skill, you may try with one light cut - after that if you can't boot (connect) phone, proceed with next little bit deeper cut, and so on.
After few phones you'll be able to make it in one move.