Need Help with 4-Way Switch Wiring and Neutral

Please see this older post of mine that should get you going. Your switch 3 has the line coming from the breaker, you need first take a picture of the wires going to the switch for backup purposes, then disconnect the wires and figure out which one is the line and which is load. These will likely be 14-2 Romex, meaning only white, black, and ground.

Then follow what I outlined here. Box 1 would be your switch 3, box 2 is your switch 2, and box 3 is your switch 1.

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