I did the same. Take your time and look out for the curtain airbag. You want the wire to not be wrapped around / interfering with the airbag.* I used my fingers to push the wire 3-4 inches under the roof liner, after loosening the door seal.
Not a place to be jabbing metal tools...
* even though given the energy in the airbag, I think the tiny coax cable would snap instantly.