Local hosted exchange (2013) to Full Online Office 365 for School District : Pointers for migration appreciated!

Good afternoon all,
The school district I manage is currently using locally hosted exchange server(s) for mail. (Server 2012 box that has Exchange 2013, and an older Server 2008 box that has Exchange 2010)
We are wanting to make the migration to full online Office 365. We're talking about 450-500 mailboxes maximum.
In order to do this as seamlessly as possible, I need some help.
Any of you pros that have any gotchas/recommendations/best practices or walk-thrus for this i'm all ears.
Thanks so much, i really appreciate any help that can be given on this.

Vasil, thank you very much for this...it really helps a lot. One question for you, and i hope i'm understanding this correctly. In our school district, we have 2000+ students, and 350~ faculty. We will still be locally managing our users (who will
be tied to email addresses that will then be hosted in office 365) through local active directory. Will this be a problem? The only reason I ask this is because of reading this: Do you want to manage user accounts in your on-premises organization? No (listed
for cutover) We will keep our user account management (if that's what this is talking about) local on the DCs that are on our domain through ADUC. Is this what it's talking about, or is it talking about managing their email addresses? Maybe i'm making this
more difficult than it is... thanks for all the help!

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