The best and easy way to do a trigger pull job on a Taurus is to put that little orange plastic disk back on the cylinder (or fill the chambers with fired cases or better yet, snap-caps) and dry fire it about 1000 times. That way you will end up with a much smoother action and not void your warrantee.
Also, as they come from the factory they are often bone-dry. So put a couple of drops of oil down in front of the hammer face after you cock the hammer. Dry firing will distribute the oil throughout the lockwork.
You can of course substitute lighter springs, but in so doing you may compromise the revolvers reliability to fire any ammunition under any circumstances.
I have a fair sized box full of ruined S&W and other makers’ lockwork – mostly hammers and triggers – that got that way because some owner, or questionable gunsmith decided to “polish” them to improve the action. They have one thing is common. In each and every case the gun owner paid out some hefty bucks to get their revolver fixed. New hammers and triggers are not inexpensive, and neither is true professional labor.