After the switch, the only advice I'd offer is to go into your new gMail settings and re-do your forwarding information if you'd still rather get school email forwarded to your personal email.

The other thing I'd suggest is migrating mail via IMAP.  The message that came out today said to forward messages, but that's stupid.  You'd lose many meaningful message attributes.  With OS X Mail (and pretty much any IMAP client) you can just set up accounts for both Gmail and USF mail, and drag from USF to Gmail.

Greg