FWIW I would leave the stock main (hammer) spring in it, and replace only the rebound (trigger return) spring with a lighter one. Otherwise, you're on the right track-- a bobbed & tuned-up Chief makes a great carry gun. I have four! Mine are all DIY jobs.
I had more than one gun cobbled up back in the day by so-called gunsmiths, so my advice is to research gunsmith candidates carefully before dropping off the gun. I don't know of any around here that I would trust. If you are handy with tools, I'm not sure you need a gunsmith anyway. IMHO you don't need or want a match grade trigger/action job on a social gun-- a light "duty tune" should suffice and you can do that yourself. All you need is a couple screwdrivers, an arkansas stone (or ultra fine sandpaper), and a 13# or so rebound spring.