Right. Here goes:
You need to have the tank on its side. Doing this means that you'll need a way to do two things:
First, spin the tank. If you haven't got a Jobo processor, then you'll need some rollers. This can be something like a Beseler Roller (see http://www.flickr.com/photos/okay_banana/3347704613/
) that will power the agitation/rolling. Another way is to get an old skateboard and cut its middle out so that the tank rolls on the opposing wheels.
The second thing you'll need to work out is a funnel/hose system to get the juice into the tank. Probably best that you Google this, as there are lots of contraptions out discussed out there. Perhaps start at LFPF; I know it's been discussed there.
This is not a difficult thing to get around, and I'd be happy to help you with this.
Once you have this up and running, you'll be happy as a pig in smelly mud with your results!