I just did mine a few days ago. I know where u are coming from when u say to remove the instrument panel...that's what I thought.
Like said, remove the shield by removing the 4 screws. That will expose the well nuts. Once u see it, then you will understand why you don't need to remove the panel.
The well nuts is made of flexi rubber and has one end molded in with a threaded nut. Dun worry, the well nuts won't accidentally slip into the instrument panel area.
Pluck out the rubber well nuts, and I use a narrow tip plier as the front well nuts are stubborn. There's some misaligned pieces of plastic panels that made the hole 'smaller'. The rear ones was easier to remove by hand.
Next, u got to remove the 'rivet'. Use a flat screwdriver to carefully pry out the core stem. Once the core stem is out, this is where it is tricky and got me stumped for a few minutes, DO NOT extend out the stem to the maximum length. You got to push the stem back a little, like about 3mm out and then pull out the entire rivet. The stem has features that prevents the clips from closing in narrow if you fully extended the stem.
That's it, the tough part is over. Re-install the well nuts to the higher points and placed the rivets to the lowest front hole.