Im sure just about any gunsmith could do a really good trigger job for you.. they are litterally so simple that anyone with a cordless drill, a couple of straight wall punches, a rubber mallet, and a pack of 600 grit sandpaper can do it (I am NOT mechanical at all.. and Ive done three now.. it really is that easy...).. I dont think you need to find a "special" gunsmith to slick up and lighten the trigger..
for less than 25 cents you can add a rubber washer to the barrel stud and "free float" the fore end.. this requires no skills at all.. just pull it out of the bag, slip it over the stud, and put the fore end back on.. this one little trick does wonders for some people..
unless youre wanting to tighten up the fit between your frame and barrel.. I dont know that you need a smith for anything honestly.. a lot of people here do that themselves too.. I havent quite ventured that far down the handi tinker road yet.. Ive got one frame that doesnt seem to want to lock up on anything I try to put on it.. as easy as everything else has been to work on... Ive been tempted to try barrel fitting next..