💬 In plain words: Treat a Salesforce data migration like a precision flight operation. Always load parent records before child records so lookup IDs exist. Switch off automation using bypass flags and defer sharing calculations. Rehearse the entire load in a Full Copy Sandbox with production-size data, time every single step, and lock in a tested rollback plan. Cutover weekend should just be a boring replay of what you already practiced.
Salesforce Basics