I had an SKS a few months back and had the same issue I just kept hitting the pin with a punch and eventually it came out. I did do a trigger job on mine and it was very easy and turned out great. As stated above if you have one slip up you could get a full auto gun that you can't control so be very careful. I just used a diamond infused sharpening stone that was the very smooth stone and on the other side was just the smooth stone I used the smooth stone to file out the grooves on the face of the sear that were left from machining and after that I used the very smooth side to polish the face of the sear. It turned out great, but be very careful if you do it yourself. Iraqveteran8888 has a video out on how to do it that I would suggest you watch.