I would also suggest not hesitating too much in cutting a hole in the drywall halfway. Too many times I've spend extra hours trying to run a line (be it plumbing, Cat, electrical) within the confines of whatever shoddy access I had just to avoid making a hole in the drywall. There is a reason no professional does it that way. Patching a small hole can be pretty inconspicuous versus the alternative of killing yourself trying to make it work with poor access.
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