You are on the right track on this. Be sure to configure the public MX records appropriately to ensure continued delivery of old and new names.
Take a look at a couple of my blog entries on things to expect.
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/saving-money-stopping-spam-change-domain-names/”>Saving Money & Stopping spam – change domain names</a>
<a href=”http://itknowledgeexchange.techtarget.com/it-trenches/i-know-who-i-am-do-you-know-my-name/”>I know who I am – Do you know my name?</a> – users will need to change website or mailing list registrations
In the IT trenches? So am I – read my <a href=”http://itknowledgeexchange.techtarget.com/it-trenches”>IT-Trenches blog</a>