For the sake of example (and because I have 8 pounds in my fridge), I will show you how to segment citrus using a pomelo. Pomelos are a very big grapefruit. In fact, they are considered the grand-daddy of grapefruit. Their rind is thick and their pith is extra thick and super spongy.
First, you will cut the top and bottom of your citrus so that you can lay it flat on one end. You want to make sure you cut low enough so that you expose the fruit.
My picture taking is questionable in general but this is where my picture taking gets uber-questionable.
I only have two hands, people!
It's depressing to see how much fruit is actually inside all that rind.