I am planning to install PoE Camera DoorBell. The current wired door bell is installed on the siding near the front door and has wires running from the attic to the doorbell. There is also a power outlet right below the door bell. There are 5 wires running in total through the wall. There is also fiberglass insulation in the wall and firestops. The roof is also low pitched and since these wires are running through an exterior wall, there is not much space to operate in the attic let alone where the attic slopes down towards the exterior wall. I am guessing I am only left with fishing the wire through the exterior siding doorbell hole which itself is about 2 inches wide (diameter) so there isn't much space for me to navigate the fish tape.
The two options I considered were to tie a pull string or the new wire to the old doorbell wire and pull it up through the attic. This would mean I lose the ability to revert back to the old bell in the future. The other option is to first fish a pull string through the wall using a fish tape and then tie the Cat5e/6 cable to the pull string and pull it through.
I wanted to know the best strategy to fish the Cat5e/6 wire through the wall without damaging existing wiring.