[Setup] basic questions for minor upgrade (2.5.1 to 2.5.3)

[bmoon]

I'm psyching myself up to migrate my Linux Plone site from 2.5.1 to 2.53. 
I'm new to Linux, so everything from making back up copies to shutting down
Plone has a learning curve. I've found some good reference sites with
specific command syntax, so I think I'm almost ready to dive in.

But before I do I need some clarification:

-  Can I upgrade straight from 2.5.1 to 2.5.3, or do I need to step to 2.5.2
first, then 2.5.3?  This isn't clear in the doc I've found.

-  The readme for the Linux Unified Installer says that "installer-based
automatic upgrades are not supported", and I'll have to copy over my Data.fs
and third-party products to a new folder.  But the upgrade doc I found on
plone.org says that if you're using "the installers", you shouldn't have to
worry about that.  I know the Windows installer just "overwrote" my existing
Plone files with the upgrades.  

It makes it sound like I've got to effectively do a new Plone installation
just to migrate.  If so, then I've got to really plan for my site to be down
a while, especially if I've got to step to 2.5.2 first. 

Thanks for any guidance, 
Bob


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