What I do is tell Calibre to add a TODO tag to book when they are added so it is easy to find them later for checking. You can specify any tags to be automatically added via Preferences->Import/Export->Adding Books where there is a field to specify the tags.
If you have a lot of books with Author/ Title switched you can then select all the ones that need changing and hit the Edit Metadata button. On the dialog box that comes up there is a checkbox for switching Author/Title over.
I then do any additional tidying up of metadata and when I am happy I remove the TODO tag.
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