If you do a search, type "Encore Trigger Job" in yahoo, you will find instructions from someone who's name I dare not mention for fear of being "Black-balled" on this site.
I downloaded the free instructions and did it myself. I did not replace any springs; I didn't need to lighten mine. I just wanted to make it smooth. After I finished, it turned out exactly like I wanted. No perceivable creep, it breaks clean and crisp. You will need good stones; the stones that he sells are good to have.
I'm not a "Smith", but I'm very mechanically inclined and I had no problems doing it. I just read the instructions thoroughly several times until I was comfortable with the procedure before I started.