Hello,
You have to remove the rear sight first, by pushing down the vertical pin that blocks the adjusting screw. Use something plastic or wood to avoid maring the slide.
With tht sight out, you can pull out the FP block and its hairpin spring, than the FP and FP spring.
Worse part is putting the rear sight in place. I remember finally unscrewing the adjusting screw.
I second the advice: don't do it if not necessary and if you are not inclined to mecanics.
L.