Be careful of the Haynes manual description! The first timing belt (I've forgotten which belt goes on first, but that would be obvious when looking at it) is timed with the crank mark and the cam mark at the top (for the crank, use the the timing mark on the flywheel). Then you'll rotate the crank 360 degrees (timing mark again visible through the inspection hole). Move the second cam so it's mark is at the top.
This means the cam marks will be 180 out, when one is at the top, the other is at the bottom. You will end up like the pic:
http://members.aol.com/k9collars2/bru/timeb.jpg
Time both marks at the top, and you'll likely run on 2 cylinders and have the other side firing with vavles open. You can imagine how I know :-)