Upgrade Shell 2.0 clarification on docs

Hi there,

I'm trying to upgrade my application from 1.3 to the 2.0.4 Cakephp
version. As a developer that does not use cakephp everyday, I've read
those two pages about upgrading:

1) http://book.cakephp.org/2.0/en/appendices/2-0-migration-guide.html
2) http://book.cakephp.org/2.0/en/console-and-shells/upgrade-shell.html

Right. Lots of changes in file structure, some deprecated functions,
new features, and also an "upgrade shell".

Okay. How do I start?

Should I maintain my actual file structure, copy the 2.0.4 version
OVER it, and then run the upgrade shell?
Or maybe I need to do the opposite, grab a fresh 2.0.4 file structure,
copy my controllers/views/models to the right folders and then run the
upgrade shell?
Or maybe I need to manually rename all my files to the new file
structure, copy to a fresh 2.0.4 folder structure, and then run the
upgrade shell?
What does the upgrade shell actually do -- and don't do -- with my app
code?

I could not find the information for any of these questions, neither
on the QA, nor in this Google Group.
Can you help? Or either, put those clarifications on the docs?

Best,
volponi

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