The 5d is a pretty heavy camera which in this case helps. Plus the focus ring on the lens I was using is pretty sweet which makes finding focus rather easy.

So given that I assume you hold the camera with your right hand, do you use a shoulder mount to free up your left hand to use the follow focus.
I did some testing and thought I could get pretty good results with a rigged up rail system that basically was two rails with a cross beam that made contact with me in my upper chest. This gave me 3 points of contact (two hands and the chest.) I tried the FF, but I thought that the fine motor skills it took to use it meant that I couldn't use that hand to support the camera.

I have some modified configurations based on the RedRock setups for DSLRs. We did some video podcasts while we were down there and you can see come images and video of my setup: athentikos.com/wordpress/

I have one setup for just hand held, tripod and Glidecam. I have another setup for shoulder mounting. Each one can be modified based on the situation. But basically it all allows be to be able to shoot and work the FF all on my own. You can even use the FF as a point of support as well.

You can't trade in a Nikon for a child :)
I have been really enjoying it - although only as a b-camera, not as my main cam. Plus the stills are a major upgrade from my D200