Been there, done that. It is best accomplished using ProVision (a tool used by Avaya and Avaya Business Partners). ProVision allows the SS to download your complete configuration, make all of the necessary changes off-line and the re-load the translations on cut-night making all of the necessary changes at once. It saves time, reduces errors, and has a much lower degree of stress involved that that of doing it manually.
I can recommend a BP who's done this before. Drop me a PM of visit my website and give me a call.
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