Log into your blog and navigate to this page, usually found by clicking on the "Design" or "Template" link in the top right hand corner of your blog...
(Note: if you have more than one blog then you will need to click on a specific blog title ~ if you change the layout for one blog you change them for all of your blogs.)
You will now be reverted back to the old interface. All of my own tutorials are written for this interface and so you can now easily navigate these tutorials.
I do plan on updating all of my tutorials to fit within the new interface once time permits so you can look for those down the line.