Simple. The spikes are all 2 blocks apart, and 2 blocks wide. Every time they move, move 4 blocks to the right. When you get to the point with the grinders, there's not really much you can do except try not to get crushed by the spikes. Having a cape here helps avoid the grinders somewhat. If you're having trouble with this part, you'll just LOVE the next section.
But the real question is... Why is a raven like a writing desk?
I write poetry when I`m not looking.