DNS server migration without downtime?

I have to migrate a few domains to my own server soon.

I would like to use everydns.net. And I am trying to avoid any downtime at all.

Would it work if I change only one name server and keep the old host's secondary server in the register's dns? And then change the secondary also after three days? Do you think this could avoid downtime?

Thanks,

Peter

 

 

 

 

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