Updating to Version 13 - what advise is available?

Are you hosted, or on-prem? We have local dev PCs, a vanilla environment, and dev, staging & production servers. We upgrade vanilla first, then local PCs, then move through the environments following a release process. We'll backup the environments (or have snapshots to go back to), as well as often running a load test on the staging env (esp for major version upgrades) before it goes to production.

Like you mentioned yourself, the level of customisation has a lot to do with how smooth it'll be. I hear v13 isn't too bad if you're upgrading from v12.

Are you hosted, or on-prem? We have local dev PCs, a vanilla environment, and dev, staging & production servers. We upgrade vanilla first, then local PCs, then move through the environments following a release process. We'll backup the environments (or have snapshots to go back to), as well as often running a load test on the staging env (esp for major version upgrades) before it goes to production.

Like you mentioned yourself, the level of customisation has a lot to do with how smooth it'll be. I hear v13 isn't too bad if you're upgrading from v12.