Airgirl> I had exactly the same aprehensions before going solo, but the euphoric feeling afterwards was worth the effort, you won't forget it for the rest of your life.
I found the 3 hours of solo circuits hard work, but I broke it down into smaller chunks of 30 to 45 minutes or until I started to feel mentally drained & would call for a full stop on the next downwind leg.
I'm now onto the Nav part of the course & its like being back at the begining of learing circuits, the workload seems insurmountable, but hopefully not impossible. The thought of doing my QXC is filling me with dread! hehe