A method and an apparatus for rigging up intervention equipment (111) in a lifting arrangement (104) utilized on a floating vessel, and moving the intervention equipment between an inoperative and an operative position, wherein the method comprising: a) providing the lifting arrangement (104) with vertically extending guiding means (203) capable of transferring a load to the lifting arrangement; b) connecting a load transferring means (215) to the guiding means (203); c) connecting the intervention equipment (111) to a load carrying device (209) provided with displacement means (214) arranged in a manner allowing a load to be horizontally displaced while carried by the load carrying device; d) connecting the load carrying device (209) to the load transferring means (215); e) moving the intervention equipment from an inactive position to an operating position by moving the displacement means (214); and f) moving the intervention equipment from the operating position to the inactive position by moving the displacement means (214).