820 to 520 migration

Next weekend we plan on moving from a model 820 to a model 520 and have
a few questions, seeing as how this is "a customer install", our first
of these sorts.

Where can I find documentation on how to do this? I assume we perform a
GO SAVE option 21 on the 820 and then restore on te 520. Does that sound
right?

Also we are migrating some tape cards, iop cards, and other comm cards
to the new box. How do I know where they should be placed?

Will the resource names be "automatically" reconfigured during the
restore? In other words, if I am using CMN02 in a line description, do I
need to manually change that line description to match the new resource
on the 520, or will it somehow find the new resource?

Thanks,
Dave