Welcome to osm! Regarding the "remove existing as final step": we generally expect people to conflate new data with existing data, so you should not remove the existing ones, but enrich them (including position acuracy if possible) with your data, and only create new objects for things that weren't mapped before.
If you haven't yet, read the guidance for automated edits https://wiki.openstreetmap.org/wiki/Automated_edits and follow the import guidelines https://wiki.openstreetmap.org/wiki/Import/Guidelines Cheers, Martin
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