calibre has several configurable open with plugins, so on my main calibre toolbar I just click open epub in editor( after highlighting a book ) & it launches sigil. Then, after the edit I click on calibre view button & it opens that epub in calibre viewer so that i can see if changes have worked as expected. I use that a lot when changing header tags / toc.
see calibre board for install details.
I synch the entire calibre library to an external hard drive once a day so if I do mess up big time there is a backup to fall back to.
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