nimrod is correct. If you are not familiar with the 94 action a competent gun smith should do the work for you.I think on any model 94 winchester lightening the trigger itself would be a matter of lightening the trigger spring and/or stoning the sears, both of which are probably better left to a gunsmith.
On my top eject 94 I loosened the hammer spring screw a little bit, which lightens tension on the hammer spring. I mainly did this to slick up the lever throw but it had the added benefit of improving the trigger pull.
Other folks on here with a better understanding of the Model 94 action will probably be of more help to you but that's my 2c.