Replace Simple Fields with ACF5

Good afternoon,

The website of our travel organization Blini Reizen uses the plugin Simple Fields on essential parts. I know the plugin hasn’t been maintained for a long time, luckily so far it’s going well (as suggested, I use the classic editor to maintain posts and pages). But if this plugin no longer works, our website will no longer work either.
Therefore I want to replace the plugin with the mentioned alternative, Advanced Custom Fields 5.x (ACF). https://support.advancedcustomfields.com/forums/topic/how-to-upgrade-simple-fields-to-acf-5/

I wonder if there are people who have already done this migration. And if so, what problems they encountered during the migration.

Thanks!

The page I need help with: [log in to see the link]