I am trying to knit this but it hurts my brain. I decided to start with a sleeve to have less stitches to manage with that ribbing chart and I keep screwing it up. ARGH!! It’s so weird and hard to keep track of even with markers.
I knitted this last year… and I found the pattern ‘confusing’ at best… and I’ve knitted for years. I finally just ‘did my own thing’… and about the only thing that is the same… is the number of stitches that I cast on! 
You can check out my ‘version’ in my projects page on ravelry. It’s a little multi-colored green baby cardigan.