Speedy's Garage has an informative video on changing spark plugs in a 5.7 engine. http://www.youtube.com/watch?v=Q8iKg-UXTb8 Challenger Spark Plug Swap.mp4 - YouTube
I use a piece of vacuum hose on the end of the plugs to start the plugs, no way to cross-thread them.
Vacuum hose...that's a great idea! I've never had an issue with cross-threading but why risk it? I'll be using that from now on.