@Kathryn I remember lesson 6! I thought it was all falling apart overnight. It’s honestly not. I switched to the new Level One shortly after and it felt like flying in comparison. I promise you you’re not a hopeless case - it’s all Lesson 6’s fault!
As Aran says, Level One is much better, but if you run out of lessons and don’t want to stop, my advice would be don’t be afraid of going back to Course 1 and the rest afterwards, even if you just press on through the difficult bits - it will come together in the end. I’m just starting Course 3 and that seemed like an impossible dream when I was ploughing my way through the 3rd miserable attempt at Lesson 6, wondering if it would be easier to gouge my brain out with a spoon.