I have done both.
Re the ignition switch: I found with my back arched very uncomfortably and my entire body weight resting on my back across the door sill, I could just barely squeeze my head and one still mobile arm into the space necessary to see and access that set screw on the ignition switch. Ignoring the claustrophobic aspect of nearly being "stuck" in this confined and contorted position, the real problem was, once my head was in position to see the screw, it was too close for my eyes to focus. So I borrowed a pair of my wife's readers. But guess what, they didn't fit so well under there & kept getting knocked off / pushed sideways by all the other crap under there, just as I would get my head into position.
I have a cheap inspection cam that let me see the target screw clearly from a more normal body position, but my arms lacked the reach and articulation to follow the stalk of the camera up there to the screw and in fact I found it hard to get the stalk and my arm up there at the same time.
Solution - my then 11 yr old gymnast daughter walked by to ask me if I would take her and a friend to a water park. "Well Sweetie, do you see this screw with the red stuff on it right here in the camera....?"
If I had it to do over: top down, battery disconnected & seat out, sock feet to be nice to my car, piece of plywood and mover's blanket over sill to be nice to my back, smallest reading glasses I can find, 3 dimensional car anatomy memorized from diagrams and inspection cam ; OR just remove more stuff and come at the darn thing from the side like I should have done to begin with!
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