I was put off sewing for over 40 years by a discouraging teacher at school. Then a friend insisted that I could make a quilt. I laughed at her, but had a go. Thanks to her encouragement and natural teaching skills, I made one - and have made many more since. I still find classes difficult: I don't find it easy to learn new practical skills, and can panic if I feel I'm falling behind the rest of the class. For that reason I tend to stick to Quilt University and this board for my learning, though I did go to a brilliant day on free motion quilting recently, taken by an ex school teacher who had planned the day well and was able to cope with the very different skill levels among the group.
Accuracy IS important, but learning curves have to be allowed too!