Timney makes a couple of different models of triggers that should fit your rifle (with or without safety lever). They are typically easy to install, and usually just require punching out a pin to remove the old trigger, and possibly some minor filework to fit the new trigger assembly, set the new trigger assembly in place, tap the pin back in, tighten a jam screw and nut, and adjust the trigger. TNT (t'ain't nuttin' tuit). If you get the one with the safety lever (assuming you want to do away with the bolt shroud safety), then you'll have a little bit of wood to remove from the stock to accomodate the safety lever.
On a scale of 1 to 10, with 1 being the easiest possible job, I rate it about a 2 to 3.