It's not a terribly hard job, but I have no idea who might be good in your area. If you want to send it out, John Gallagher in Jasper, AL is a Ruger guru and good guy. I'll pm you his email address if you're interested.
What makes you think the forcing cone needs re-cut? Is there a problem with shaving lead or something?
If you have very basic dis-assembly skills, you might consider installing a spring kit from Wolff or other maker. These can provide a pretty decent trigger at modest cost. If you're looking for a 2 lb. trigger, you'll need a gunsmith.