Set up a staging GitLab CE instance and migrate one representative project with branches, merge requests, issues, and CI configuration. Confirm permission roles, runner access, artifacts, and whether links and comments remain useful after migration.
Self-hosting makes upgrades, backups, storage, and incident response your responsibility. Rehearse a backup restore and a version upgrade before moving critical code. The decision is less about whether Git works and more about whether the whole development workflow can be operated reliably.
Akousa