PageEdit cuts the amount of work to get there in half.
1 click on the PageEdit icon (looks like a pencil on a page) instead of double click on the tab.
There are lots of threads and basic instructions here to get it set up. It's as easy as:
1) download PageEdit
2) install PageEdit
3) go to Sigil preferences and assign PageEdit as your external HTML editor of choice.
Happy Holidays to you as well!