jim evans wrote:
....
I'm a little uncertain about that. I tried to push a flat plumbers
snake (which I've used to fish wires before) up the wall and couldn't
get it to go. ...

Start at upper point and go down instead of up and use something stiffer
and smaller diameter (like baling wire size/stiffness) initially.

What is the actual insulation and how compressed is it? If they really
packed the cavity full (was assuming just a R-9 batt in a 2x4 wall which
would leave a lot of air space) may be a trick. How far you gotta' try
to go?

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