Assuming you have the version with the removable trim piece.
First, Remove the crank hole trim piece by prying the two tangs at the back so that it can move away from the insert.
Second, Pull the wedges out of the back of the grill bars then slide the crank hole trim piece away from the bars.
Third, Start at one end, use a flat blade screwdriver, pry the trim piece up and away from the insert frame. Go slow, move in small increments, work the edge up, move along a few inches, work the edge up, repeat, repeat, repeat, repeat,
Primary objective DO NO DAMAGE. This trim piece is very easy to work, easy to remove dents and dings then polish.
When re-installing, start at the top center, no tools necessary, use your thumbs.