I also would not advise to use Calibre. The code that it produces is, although correct, not user/editor friendly at all and can be done much better.
I personally use my own add-in for the process that consist out of several procedures to help check the Word document and even create a basic ePUB out of it (with clean code). You will need to touch it up in Sigil, especially with regards to the TOC.
You can find it via my sig.
The macro also still works of course.
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