Step by step guides will hard to come by. I've never dismantled that notebook, but I've taken apart a good 30 more or so. Here's a small set of guidlines you can follow:
1. Start by removing all easily removable pars - RAM, disk drives, etc.
2. Move to the bottom of the unit, and remove all the screws.
3. Turn it over and remove the plastic plate that is directly above the keyboard.
4. Then remove the keyboard.
5. You should now look to see what your next move is. Use your common sense. If you can't figure out how to remove a panel, stop, take a breathe (don't get frustrated!), get a flashlight, and spend a few minutes just looking at the notebook.
6. You should eventually get to a point to where you can remove the entire top deck...