The best advice for fishing wires through insulation is avoid it if you can the potential is always there to damage the vapor barrier or bunch up insulation leaving cold spots in the wall.
Fishing wire through foam insulation.
Keep the fish tape against the inner edge of the drywall and out of the insulation as you feed it toward the upper hole.
I would also run hdmi for the projector.
Basically drill through the wall top plate from the attic and drop speaker wire down the wall then fish it from a hole in the wall near the floor.
However it dawned on me that 2 of the walls are exterior and filled with spray foam insulation.
While handling fiberglass insulation wear gloves eye protection and a mask that covers your mouth and nose.
You can push the wire leader with the cable attached toward the sheetrock or the side with the opening.
Out exterior walls and one interior wall are insulated with icynene foam insulation thius they are very tight unlike batt insualtion.
Thread wires past insulation.
If the wall contains insulation try to fish the wire between the outer paper or plastic cover and the wall.
5 attach the wiring in the 3 by 5 inch hole to the end of the fish.
The magnetic fish tunnels right under it.
Then using short pulling motions pull the leader magnet right through the insulation to the opening.
Then pull the socket end from below to snake your electric wiring through the spray foam insulation in the wall.
Fishing wire foam insulation.
The fish n pull kit provides the right tools to get the job done fast and insulation is no longer a problem.
Product description fish n pull is the world s simplest and fastest way to fish wire cables and tubing through walls ceilings and even floors.
Affix the other end of the fish tape which is the one that remained above to your electrical wire by wrapping it together with electric tape.
If you must fish wires through exterior walls the best tip is to avoid spinning the flex bit until you make solid contact with the wood you plan to drill through.