You can also replace that spring with a lighter spring. You can get a lighter tension spring from a gunsmith for a couple dollars.

In order to have a clean breaking (no creap) and light trigger, it's imperative that the contact points on the sear and the trigger be polished. This can be kinda tricky however because it's VERY important that these surfaces remain flat. If you round off the notch on the sear it could make your gun unsafe.