The only suggestion I can make is to print out the exploded view of the pistol, or just open the manual to that page, while following along with the text. If I remember correctly, the parts are identified by number in the text. If they are not, drop me an email and I will send you the text with the numbers.
Believe me, if you stare at the parts in the frame after field stripping for a long enough time, you will see exactly where the smoothing needs to be done. It is not like a pistol with traditional fire control parts. Pretty much everything is out in the open and visible when you pull the trigger. Just watch where parts rub against one another. That's where you polish
Good shooting,
Mike