When to tell Google Webmaster Tools that domain has moved?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Arseniy Bolotsko: When to tell Google Webmaster Tools that domain has moved.
  
  I have moved a site to a different domain name and did a complete overhaul. Link structure has changed because the old one was very bad. That being said, I am doing 301's manually on about 1800 pages. I prioritize what to move first based on SEO Landing Pages report in Google Analytics. Stuff that has most impressions and clicks goes first and some content is clearly bad so I will just 301 to a suitable section of the new site. I am about half way done with my 301's.
  
  Should I wait until I finish all my 301s or can I indicate in Google Webmaster Tools that the domain has moved?
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  Edwin Jonk: In GWT on the left side there is a gear menu. This dropdown menu has "change of address". Use that to tell google that your site has been moved.
  https://www.google.com/webmasters/tools/change-address
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  Arseniy Bolotsko: +Edwin Jonk ;Thanks. I know how to change it. My questions was about when to change it for a particular situation.
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  Edwin Jonk: I see. I would do that after the 301's.
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  Edwin Jonk: From the expert panel in this weeks SEO Questions hangout on air on 00:50:39 into the YouTube video: https://dumbseoquestions.com/q/when_to_tell_google_webmaster_tools_that_domain_has_moved +Arseniy Bolotsko
  
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  Edwin Jonk: Reference from the video:
  https://support.google.com/webmasters/topic/6029673?hl=en&ref_topic=6001951