Large 1" Gap between new flooring and trim. Help!
I would have either


removed the door trims, trim as necessary then refitted after,
cut the door trims in-situ so that the new floor would slide under.


Have used both methods in the past - often depends on how hard it would be to remove the old door trim (sometimes they are so old they split), but cutting in-situ can be difficult - have used just a blade held in a rag as one solution.