This will be your best friend:
2006 LT-R Service Manual
- big ass allen wrench
- feeler guage
- careful when your working with the gas lines connected to the tank. If your too rough with the tank you could snap the plastic connector off the fuel pump if they are still hooked up.
- make sure to ziptie your timing chain so it doesnt fall in the head
- be ready to get covered in gas.
Take your time and you'll be fine.
Hopefully this helps. Good luck.