I ended up figuring out how. The screen I reached at first appeared to dead-end with no way out except to accept Expert Assist. But there is a hyperlink near the bottom that says "See other TurboTax products". Click that and a pop-up window shows 3 options in a table form showing features of each. The three options are "Do It Yourself", "Expert Assist" and "Expert Full Service". At the bottom of the table, two of the columns have "Select" in blue and you can select either of those, and the third column has Selected in black and of course isn't selectable (it's already selected). Of course, "Expert Assist" is "Selected". So just "Select" the DIY column and you have now selected the option we're all familiar with.
