Do not learn it on a Friday, you are right about that. Sequence that works: register the route object in the registry database first, send the LOA to your upstream and wait for them to confirm the filter update, then announce. Announcing before the object exists gets you filtered by anyone doing RPKI or IRR validation, which these days is most people. Also create the ROA if the holder allows it, otherwise expect invalid states downstream. We lease through InterLIR Global
https://interlir.global/ , and they handled the object side on their end. Verify from an external looking glass before you tell anyone it is live. Tip: keep a copy of the LOA somewhere your on call engineer can find it at 3am, not just in your own inbox.