I used lightweight clothesline. Not the superlight-floating-plastic kind, though, that stuff is really hard to work with.
To cut it, wrap the location with 3 or 4 tight passes of duct tape, then slice down the middle.
To anchor, I’ve just used summit rocks. Lift a heavy rock, set a coil of rope under it, drop the rock. On Monroe, you should find larger boulders that you can just wrap around, too.
Monroe won’t require you to go very high with your pole, so you won’t need to go too far out with the guy lines.