Heather - I struggled too. Hated that first block. Mine are super scrappy, so I needed to check/trim at every step because the fabrics are different weights and stiffnesses. I focused on making a pile of 9-patches - they became more consistent and I checked/trimmed again as necessary to square them up. And I churned out 13 more double-9-patch blocks yesterday. I think the repetition of making many of the same unit helped. The trimming was definitely necessary. Good luck!
Adding my block photo below. I'm working on 3 scrappy quilts concurrently, so saved all the tiny scraps, knowing we had these Double 9-Patches coming up. So I used all the tiny bits. I also realized that these pieces are so tiny, I could use up my "ugly fabric", so into the mix it went too. I've used 4 background fabrics and over 20 prints so far.