Thread wires past insulation.
Fishing wire through walls tools.
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Flex bits and glow rods are the go to tools pros use for fishing wires.
If there is no cover press the wire against a stud and use it as a guide.
Fishing electrical wire through walls check the whole wall cavity with a stud finder.
If the wall contains insulation try to fish the wire between the outer paper or plastic cover and the wall.
A decent stud finder is a must have for every wire fishing job but.
While handling fiberglass insulation wear gloves eye protection and a mask that covers your mouth and nose.
Fish tape wire puller through wall wire threader fish plus fish cable fastener with steel rope 20ft 6m.
Bend the wires over then wrap several loops of electrical tape around the wires and the end of the fish tape.