I tried doing a fishermans rib once, actually made several attempts but could never get it to work. I discovered that if I made a mistake it was impossible for me to fix. When I asked my good friend who used to own the LYS we had (past tense) here if she had any secrets she said, "Don't make any mistakes."
I actually thought I could do that at first, but found out I couldn't. So had to give up.
I had knit ones in the row below on every row. Someone once suggested to someone here on the forum to try using a lifeline, and I thought maybe I'd get back to that little baby sweater and try that. Maybe??