Goto step 32. Seems like if you put the rear sight (step 33) at a 45 degree angle, it will tap out easier. First time I did it I had help, once we did it the first time it was easier the next time. I used a wooden dowel to tap it out with a hammer.
With the tension on the spring it seems like it won't come out. Having the 45 angle helps with that. Probably been 2/3 years since I've done one though.
Remove the tiny diameter cross pin if it uses one and press straight down hard on the nose of the ramp.
After it sinks down far enough you will be able to move it rearward and remove.
The spring tension is considerable, so a helper to hold the rifle or better a soft jaw rifle vise makes all the difference.
I've done it many times and it can be a bitch, so use a soft vise or the rifle will slam over on it's side when you push hard enough to depress the spring.