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If you select all the files (or-group of them) from the file browser on the left side, then right click to rename, you will be allowed to define a template. The default is "Section0001", but I usually change it to "Ch_01". When you click OK Sigil will automatically rename the selected files while auto-incrementing the number. If you have multiple books you can select each books' files and rename "Book1_Ch01", "Book2_Ch01", etc.
Sigil also automatically corrects all the links when you rename.
The whole process shouldn't take more than 1-2 minutes.
Glad to hear you taking the ePub plunge!
Cheers,
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