I try to follow these ideas, and in many of my notebooks I frequently test them by occasionally running "restart kernel and run all cells" from the menu, which

I try to follow these ideas, and in many of my notebooks I frequently test them by occasionally running "restart kernel and run all cells" from the menu, which tends to point out anything I've accidentally moved or run out of order. As a table of contents, I usually write some markdown up top with links to markdown HTML anchors elsewhere in the page, which themselves also have a link back to the TOC. Works pretty well. Will have to check out that extension.