First, NEVER do something for the first time on a paying gig.
Are you talking about the Technicolor setting? if so there is a LUT that you load into the footage (need LUT Buddy by Redgiant) this gets you close. Then you do the finishing touches.
WIthout seeing your footage it is hard to say other than lowering the blacks, raising the highlights to get the contrast back. You normally add back the saturation. But for color that depends on how well it was shot, is is white balanced correctly?
This is a commitment to heavy grading operation and better done with Color or Colorista. 3-Way is great for light grading but can fall apart quickly.