You don t want to find out the hard way that you should have fished your wire one stud cavity to the left or right.
How to run wire through walls without cutting drywall.
The true focus of the task should be the electrical wiring not rough carpentry and demolition work.
Use your stud finder to check the whole wall cavity for obstacles like blocking and abandoned headers.
If the wall above runs parallel to the attic or basement joist this cable will be attached across the side of a joist.
When adding or replacing wiring in finished walls most electricians will attempt to make the horizontal portion of the cable run in the unfinished attic or basement crawlspace areas looping the cable down or up through the wall cavity across the floor or ceiling joists then vertically through another stud cavity to the next wall box opening.
Cut the cable leaving plenty of slack and feed the cut end into the wall cavity and out through the wall hole as you did with the first box.
Roll out the cable through the basement or attic space to the next box location.
Prepare for that by moving insulation away from the walls through which you need to pass the wires and marking the existing wires you need to remove.
A decent stud finder is a must have for every wire fishing job but don t throw it back in your pouch after you ve located the studs.
Cutting into drywall is little more than collateral damage that needs to be minimized.
Pierce the drywall with the tip of a drywall saw on the left or right side of one of the pencil marks on the wall.
A drywall saw is a long slender knife with sharp cutting teeth.