Either you're vets and already know how big Expansions launchs are, or New Players at your first experience with such thing... remember: [b]prepare a B plan for tomorrow. [/b]
It's much likely -as EVERYTIME- that Servers will crash, there will be a lot of error codes, continuos return to orbit, lags, queues with illogical times and eventually Bungie will bring servers down for emergency maintenance.
Prepare a B plan. Another game to play with, go out, read a book, watch a TV series, whatever. Just be sure to be prepared for this.
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Now is the time to eat and get snacks ready. Once you're in you'll forget to eat and probably die.