In all fairness, the WYSIWYG modus of Sigil is not used that much by the 'hardcore' members. Almost all of the 'serious' e-bookmakers work in codeview. Using the bookview will get you into issues sooner than later.
That being said, the only way to progress is by doing it and studying how other books have been made.
I will not say anything about converting docx to ePUB via Calibre, the changes are big that I say something that isn't true or taken the wrong way. I don't use it anyway. I use my add-in to create an ePUB directly from Word.
Lists in ePUB can be a hit and a miss. Unordered lists should be fine, ordered lists are a different thing. Not everything will then work as thought. Now, I do not know how Calibre converts the list of a Word document to HTML, but I do know that it can be difficult to make the distinction from a docx document. So, it could a conversion issue.
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