Over at Macworld, Glenn Fleishman recounts what it was like to upgrade to Lion at an Apple Store, something that people without sufficient bandwidth might consider doing. The moral of the story? Bring an iPad or a book and plan to spend a few hours at the task. follow link
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Upgrading to Lion at an Apple Store
Check out the Take Control ebooks that expand on the topic in this article:
Upgrade to Lion successfully with Joe Kissell's advice, gained through countless test installs. Learn what to do if you can't download from the App Store, avoid problems, and perform key post-upgrade tasks. Covers upgrading from Tiger or Leopard, Lion Server installation basics, migrating to a new Mac, and Recovery mode.