I've typically just cradled the camera under my right arm and hold it snug against my torso. You'll feel this is using your bicep, upper right rhomboids, and often left side of your lower back for support. I wouldn't recommend doing it full time for multiple days this way, but a few scenes/shots you should be able to handle. I'll then use my right arm to support the front closer to the nodal point of the lens or by using some sort of short grip off a rosette close to that point. This is similar to how a fireman holds a water hose. I prefer this over sitting on the shoulder as sitting disengages your core.
