tyrro if you look at each update instructions, a lot of the instructions are the same. You can basically do everything a single time to jump to the latest version. We do recommend reading each release note still because there might be some additional commands provided, for example the changes to flarum/auth-* extensions that need to be removed.
If you're just considering the database migration and are re-installing Flarum anyway, you can just install a new Flarum 1.0, import the existing database, then run php flarum migrate. All of the database migrations will be run that way.
Additional note: if you have very old Flagrow extensions, you might need to jump to an intermediate version to be able to run their special migrations to the FriendsOfFlarum versions.
