I have fish tape, but honestly my preferred fishing device is just a long thin strip of wood or even a few strips taped together to make one even longer. I have so many offcuts from boards I've ripped that I've got lots of these things kicking around. I take a utility knife and just cut them in half lengthwise so I end up with something like 1/8 inch think, 1/4 inch wide, and 15 feet long. Plenty flexible, but also wants to go straight when you push on it.
Fish tape comes on a reel and gets a pronounced curve to it, and you have to try to bend it straight so you can push it straight to your goal. It works, but for me, I can't get rid of the curve in the tape and it tends to want to go off in directions I don't want.
I never did it under carpet. Can you use extra speaker wire and find an easier path? I've tucked speaker wire around the edge of wall to wall carpet so that it goes into the gap between the molding and the tackless stripping. In the room where I did that, it's completely hidden. I just kind of poked it into the corner with my fingers and also carefully used a putty knife. It was super easy. This wasn't half inch thick monster cable though, just speaker wire the thickness of lamp cord.
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