Any domain migration checklists?

I'm planning to migrate domains (switching from the github.io domain to my own), and I'm wondering what tips, pitfalls and checklists y'all have for migrating between domains.

Currently, I'm planning to just have the github.io domain redirect to my new one, so if people stumble on the old link or I forget to change it somewhere they'll still get to my actual site.

Also, if you have any places where I might forget to change my website link - please comment!