use VDMs (virtual datamovers), size file systems properly (you can expand on the fly, can't shrink file systems). Take advantage of Snapsure (snapshots), ABE (access based enumeration). Use emcopy/robocopy/sharedupe for migrations.

I'd also add, understand your options for backup and recovery.  Understand how NDMP backups differ from client-based backups within an OS.  I highly recommend many of the instructional EMC videos on the web.  They'll give you ideas to ask more questions and discover other ways of doing things.

Good luck!