To lighten the trigger you can replace the mainspring and the trigger return spring. I used a Wolf spring kit in mine with the lightest springs they offered and it really improved the trigger pull. I've shot from mild 38s to hot 357s and it's just as reliable as before.
I also polished the surfaces but if you decide to do that be extremely careful and go very slow. You are removing metal and the goal is only to smooth, not change dimensions or angles of anything.
If the pain is lacking so is the discipline...
"the only 911 call I need is chambering a round" - Mr. Muller, MO car dealer