From memory, in the A pillar you cant really see the airbag - just a strap from the end of it. Also not sure there was any airbag wiring here either - just a drain for the sunroof (if present). I could be wrong though and better to be safe than sorry!
What I do remember was that getting the trim off was easy - putting it back on was a pain as its shaped to fit perfectly in place, making it hard to get back on at the bottom where it meets the dash.
I had also read the airbag cover plate over the screw is a one time use so I bought a spare ahead of routing some cables. I ripped the airbag plate off with no care at all and somehow it didn't break so the spare was un-needed (and I believe relatively expensive, for a piece of plastic
)