Continue making your way around the house in this fashion until you reach the last plane. This is the last wall surface that needs to be sided. You're going to do this wall in just the same way except there is one difference that needs to be noted. You now have two corners that must match up.

The first course should go pretty easy since the starter will help it go from point to point, but on the second course, start paying attention to your corners. Make sure you are matching up on both ends. Depending on the house, this could occur on two outside corners, two inside corners, or one of each.
Now in this picture, the top-right piece has not yet been nailed, but notice how it is sagging. If you don't catch that, you might nail it and it will continue to exaggerate and get worse with each course.

Getting Ready to Move Up

Once you've gone all the way around the house as far as you can reach at that level, you'll need to prepare to move up in the world. The most efficient method is two extension ladders, a set of ladder jacks, and a 'cat walk'. Most do-it-yourselfers don't have those laying around, but if you can find a place to rent them, it will be worth your while. This is, of course, assuming you have a two or three story house to side. If it's only one story, all you need is a couple of saw horses and the cat walk. A cat walk is usually made from aluminum and is very rigid. It is a plank that is fairly light and can span longer distances than say, a 2 x 8. At this point, you might also want to enlist a third helper so that you and the other installer can stay on the cat walk while they give you material. This is especially helpful when you are up 15'.

Before you start putting more siding up, don't forget to nail any corners once you move to the next position. When you get up to the roof, here's how you'll deal with it.