For anyone having trouble with the flasher, I found it easiest to lay upside down in the footwell, then pop out the clip from the metal bracket. Then you have much more room and leverage to separate the flasher from the clip.
My old flasher has a small chunk of plastic missing from it. I tried the flathead screwdriver, but that didn't work for me. I was probably pulling/prying in the wrong direction
I didn't take a picture, but the back side of the clip sort of looks like this. I just wiggled it back and forth and it popped out.
