The spring is easy to change and it will lighten the trigger pull. All of mine also had a bunch of creep which this will not help. That requires stoning which I leave to a gunsmith. If your smith is like mine a trigger job cost the same amount whether he is just getting rid of the creep or doing that and lightening the pull also. So if you have no creep, change the spring. If you have creep just take it to a smith.
Like the others have said, simply changing the springs is very easy.
Like Bullseye said though, this will not reduce the creep. I've re-worked at least a couple hundred triggers in quite a few variations of rifles, so I opted to re-work my own in my Single Six, and Blackhawk.
The trigger system in the single action Rugers is actually fairly simple as revolver triggers go, but it's still a very precise procedure. If you don't have a good bit of experience in this area(triggers) then I also suggest you get a good smith to do the work.