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I don't know any way to do everything "automatically"
What will you do with the old domain? Park it or let it go? This has to be considered for the future as no SE I know has ever forgotten a url it has indexed. And this is necessary for at least a time period for the redirects to work...
I generally tell clients to keep the old domain for infinity and beyond. ;)
I generally tell clients to keep the old domain for infinity and beyond.