The only "D" I ever made in my life was in 5th grade Penmanship class at Sacred Heart School. When I brought home the report card my Daddy LAUGHED! Mom got real mad at him for making light of it, but he said just look at HIS handwriting! Actually mine looks a lot like his did. Mom has lovely handwriting because her generation worked a lot harder at it. And she stayed in school til the 11th grade, Dad dropped out in the 8th grade (thought both completed their GEDs when they were in their 50s which impressed us kids!)
I eventually developed a writing style that uses Block printed capital letters then go from there with cursive. That way I avoid the ridiculous Qs and other curlicue letters. But if I write in a hurry, it is still barely legible; my kids can't read it at all!