You really don't have to worry about combining plant proteins to form complete proteins. Current research indicates that as long as you eat a decently varied diet your body will take care of any adjustments it needs.
At the risk of sounding like a shill I'd suggest checking out the Engine 2 Diet
. I've been following it since February and have lost 45 pounds and brought my Diabetes under very good control. My Doctor says it's gone, but I wouldn't go that far just yet.