I'm getting ready to shim my fuel pressure relief valve and i was wondering if there was anything i need to know. I know that the glow plug bracket is a pain to get off, and I know that sometimes the valve has been tightened by the hand of god. but is there anything else i need to know before i begin? Do i need to crack any lines or wait for the fuel pressure to drop?

http://www.dieselplace.com/forum/showthread.php?t=37711&highlight=shim

You have listed everything you need to know.